Binoculars are a pair of identical telescopes mounted side-by-side that allow for binocular vision and depth perception. They come in a variety of sizes and focuses and have different focusing mechanisms. Digital camera binoculars combine binoculars with a digital camera to allow users to photograph or video what they see. Image-stabilized binoculars minimize shaking from hand movements through compensation mechanisms.
A viewfinder is what photographers look through to compose and focus pictures. Optical viewfinders display around 90-95% of the image but LCD screens have advantages like convenience in bright light. Despite LCD benefits, pro photographers prefer viewfinders for steady shots without glare or drained batteries. A lens gathers and focuses light, with different types for purposes like wide angles, telephotos, and macros. An image sensor detects and conveys image information by converting light waves into electronic signals. Common sensor types are CCD, CMOS, and LiveMOS. The aperture is the opening at the rear of the lens that controls how much light reaches the image sensor.
Photography is something that quickly turned from being a hobby, to being a serious career option. Thanks to the advancements in modern technologies, the adage “a picture is worth a thousand words” seems truer to life than it ever was. One can zoom in with their camera lens and even admire the various craters on the moon! With the ever-increasing need of news stories and the advancements in mass communication, a camera now holds a more important position that it ever did. Thanks to this small machine, what was once considered an out-of-the-box, low pay grade career option, is now a high-paying respectable job.
This document discusses the science behind stereoscopy and 3D imaging. It begins with an introduction to stereoscopy and how it creates an illusion of depth by presenting two offset images separately to each eye. Next, it explains how binocular vision allows our brain to perceive 3D from these 2D images by overlapping the fields of view from each eye. Then, it contrasts normal images, which both eyes see the same, with stereoscopic images, where each eye sees a slightly different image to create the perception of depth. The document proceeds to describe several stereoscopic techniques throughout history and modern applications such as 3D movies, TV, cameras and more. It concludes that stereoscopy is a rapidly progressing field used across entertainment, medical and
Stereoscopic imaging uses two slightly different images taken from slightly different angles to create the illusion of depth when viewed through special viewers or displays. The document discusses the history of stereoscopic imaging from the 1833 invention of the first stereoscope to modern digital techniques. It describes how stereoscopy works by simulating the different perspectives seen by the left and right eyes. The document outlines various techniques for capturing, viewing, and displaying stereoscopic images including film and digital photography, anaglyph, polarized, and autostereoscopic viewing methods. Applications of stereoscopic imaging span entertainment, education, medicine, and space exploration.
Stereoscopy, also known as 3D imaging, refers to a technique that creates the illusion of depth by presenting two offset images separately to the left and right eyes. The brain then combines these 2D images into a perception of 3D depth. Modern 3D technology uses different methods like lenses, polarization, or head-mounted displays to show each eye a different image. Stereoscopic cameras also use two lenses to capture separate images for each eye, mimicking human binocular vision. While 3D continues to be applied to movies, TV shows, games and videos, its value is debated as rushed 3D conversions may undermine adoption of the technology by providing an inferior product.
Stereoscopic imaging uses two slightly different images, one for each eye, to give the perception of depth. It originated in the 1800s with the development of stereoscopes and stereo cameras. Today stereoscopic techniques include anaglyph, polarization, and shutter glasses methods. Stereoscopic imaging has applications in entertainment, medicine, space exploration, and more. Future developments may allow glass-free 3D viewing through techniques like autostereoscopy.
The document discusses different types of telescopes that can be used as low vision aids for patients with visual impairments. It describes Galilean and Keplerian telescopes, as well as examples of telescopes categorized by their utility, including handheld telescopes, spectacle-mounted telescopes, bioptic telescopes, MaxTV glasses, Ocutech telescopes, and Selsi sportglasses. Procedures for trials of telescopes are provided. Factors that determine the appropriate magnification system include ease of use, mobility requirements, and image quality considerations.
Volk Optical Inc. is a world leader in ophthalmic lenses and equipment located in Mentor, Ohio. Founded in 1975 by ophthalmologist David Volk, the company produces diagnostic, therapeutic, and surgical lenses and accessories. Volk Optical is known for Dr. Volk's original aspheric lens designs from the 1940s and offers a wide range of classic and digital lens types, including slit lamp, contact, imaging, and gonio lenses. The company prides itself on extensive warranties, high quality glass optics, new product development, and providing the best overall value in ophthalmic lenses.
A viewfinder is what photographers look through to compose and focus pictures. Optical viewfinders display around 90-95% of the image but LCD screens have advantages like convenience in bright light. Despite LCD benefits, pro photographers prefer viewfinders for steady shots without glare or drained batteries. A lens gathers and focuses light, with different types for purposes like wide angles, telephotos, and macros. An image sensor detects and conveys image information by converting light waves into electronic signals. Common sensor types are CCD, CMOS, and LiveMOS. The aperture is the opening at the rear of the lens that controls how much light reaches the image sensor.
Photography is something that quickly turned from being a hobby, to being a serious career option. Thanks to the advancements in modern technologies, the adage “a picture is worth a thousand words” seems truer to life than it ever was. One can zoom in with their camera lens and even admire the various craters on the moon! With the ever-increasing need of news stories and the advancements in mass communication, a camera now holds a more important position that it ever did. Thanks to this small machine, what was once considered an out-of-the-box, low pay grade career option, is now a high-paying respectable job.
This document discusses the science behind stereoscopy and 3D imaging. It begins with an introduction to stereoscopy and how it creates an illusion of depth by presenting two offset images separately to each eye. Next, it explains how binocular vision allows our brain to perceive 3D from these 2D images by overlapping the fields of view from each eye. Then, it contrasts normal images, which both eyes see the same, with stereoscopic images, where each eye sees a slightly different image to create the perception of depth. The document proceeds to describe several stereoscopic techniques throughout history and modern applications such as 3D movies, TV, cameras and more. It concludes that stereoscopy is a rapidly progressing field used across entertainment, medical and
Stereoscopic imaging uses two slightly different images taken from slightly different angles to create the illusion of depth when viewed through special viewers or displays. The document discusses the history of stereoscopic imaging from the 1833 invention of the first stereoscope to modern digital techniques. It describes how stereoscopy works by simulating the different perspectives seen by the left and right eyes. The document outlines various techniques for capturing, viewing, and displaying stereoscopic images including film and digital photography, anaglyph, polarized, and autostereoscopic viewing methods. Applications of stereoscopic imaging span entertainment, education, medicine, and space exploration.
Stereoscopy, also known as 3D imaging, refers to a technique that creates the illusion of depth by presenting two offset images separately to the left and right eyes. The brain then combines these 2D images into a perception of 3D depth. Modern 3D technology uses different methods like lenses, polarization, or head-mounted displays to show each eye a different image. Stereoscopic cameras also use two lenses to capture separate images for each eye, mimicking human binocular vision. While 3D continues to be applied to movies, TV shows, games and videos, its value is debated as rushed 3D conversions may undermine adoption of the technology by providing an inferior product.
Stereoscopic imaging uses two slightly different images, one for each eye, to give the perception of depth. It originated in the 1800s with the development of stereoscopes and stereo cameras. Today stereoscopic techniques include anaglyph, polarization, and shutter glasses methods. Stereoscopic imaging has applications in entertainment, medicine, space exploration, and more. Future developments may allow glass-free 3D viewing through techniques like autostereoscopy.
The document discusses different types of telescopes that can be used as low vision aids for patients with visual impairments. It describes Galilean and Keplerian telescopes, as well as examples of telescopes categorized by their utility, including handheld telescopes, spectacle-mounted telescopes, bioptic telescopes, MaxTV glasses, Ocutech telescopes, and Selsi sportglasses. Procedures for trials of telescopes are provided. Factors that determine the appropriate magnification system include ease of use, mobility requirements, and image quality considerations.
Volk Optical Inc. is a world leader in ophthalmic lenses and equipment located in Mentor, Ohio. Founded in 1975 by ophthalmologist David Volk, the company produces diagnostic, therapeutic, and surgical lenses and accessories. Volk Optical is known for Dr. Volk's original aspheric lens designs from the 1940s and offers a wide range of classic and digital lens types, including slit lamp, contact, imaging, and gonio lenses. The company prides itself on extensive warranties, high quality glass optics, new product development, and providing the best overall value in ophthalmic lenses.
Digital photography /certified fixed orthodontic courses by Indian dental ac...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Magnifiers is a type of magnifying glass or lens.
It consists of high convex lens.
It is mounted on a frame with handle or without handle.
Magnifiers mostly used in low vision patients.
Magnifiers are of 5 types available;
1. Hand magnifiers
2. Spectacle magnifier
3. Stand magnifier
4. Telescopic magnifier
5. CCTV
These types of magnifiers details in this pdf.
THANK YOU..
The slit lamp is an instrument used to conduct biomicroscopy of the anterior segment of the eye. It consists of an observation system including eyepieces and objectives, an illumination system to illuminate the eye, and a mechanical support system. Various models exist with different configurations such as the Czapski scope with rotating objectives or zoom systems. The slit lamp can be used to examine the eyelids, conjunctiva, cornea, anterior chamber, iris, lens and vitreous humor. Different illumination techniques such as diffuse, direct focal, indirect, retroillumination and specular reflection allow visualization of different ocular structures. The slit lamp is useful for procedures such as foreign body removal and contact lens fitting examinations.
For the full video of this presentation, please visit:
https://www.edge-ai-vision.com/2021/02/eye-tracking-for-the-future-a-presentation-from-parallel-rules/
Peter Milford, President of Parallel Rules, presents the “Eye Tracking for the Future” tutorial at the September 2020 Embedded Vision Summit.
Eye tracking is an increasingly important technology for applications ranging from augmented and virtual reality head-mounted displays to automotive driver monitoring. In this talk, Milford introduces eye tracking techniques and technical challenges. He also explores camera and computational requirements for eye tracking, and highlights selected use cases and applications.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The document compares how the eye and camera work to form images. Both have a lens that allows light to pass through and hit a light-sensitive surface - the retina in the eye and the image sensor in the camera - which records the light patterns to create the image. While the eye instantly processes images, the camera is able to retain much more visual detail by using a shutter release button to capture images.
The human eye allows us to see by allowing light to enter through the cornea and lens, which focuses the light onto the retina. The lens adjusts its curvature, a process called accommodation, to focus on objects at different distances, with the help of ciliary muscles. The retina contains light-sensitive cells that detect the image and send signals to the brain via the optic nerve. Some common vision problems include myopia, where the eye focuses images in front of the retina, hypermetropia where images are focused behind the retina, and presbyopia which occurs due to weakening muscles with age.
Visual impairment and low vision can be caused by eye diseases, accidents, or conditions present from birth. It affects a person's ability to see clearly or fully. Visual acuity tests measure sharpness of vision and is recorded as a fraction where the top number is the distance and bottom is the font size seen clearly. Normal vision is 20/20. Low vision is defined as visual acuity between 20/70 and 20/200 or visual field less than 20 degrees, even with correction. Devices like magnifiers, telescopes and electronic magnifiers can help those with low vision maximize their remaining sight.
This document discusses low vision aids and their use for people with visual impairments. It defines low vision according to the WHO and describes common causes of visual dysfunction like macular degeneration and glaucoma. The goals of low vision rehabilitation are to maintain and improve visual function through clinical assessment and optometric intervention. Low vision aids can be optical devices like magnifying glasses, telescopes, or non-optical devices that alter lighting, contrast and size of objects. Common optical devices discussed include magnifying spectacles, hand magnifiers, stand magnifiers, and telescopes.
The document discusses the structure and function of the human eye. It describes how light enters through the cornea and pupil, and is focused onto the retina by the lens. The retina contains light-sensitive rod and cone cells which convert light into electrical signals sent to the brain via the optic nerve. Common eye diseases like myopia, hyperopia, astigmatism, glaucoma and cataracts are also outlined, as well as modern vision correction methods like contact lenses and LASIK surgery.
These lectures has prepared for postgraduate student (Ophthalmology) according to the curriculum of Bangladesh College of Physician and Surgeons (BCPS) and Bangabondhu Sheikh Mujib Medical University (BSMMU) Bangladesh
Focal length signifies the distance from the optical center of the lens to the image sensor of your camera and is measured in millimeters. The lens' focal length determines how large the object will appear in the frame and how wide the lens' angle of view will be.
This module discusses optical instruments. It covers the human eye, cameras, microscopes, telescopes, and holograms. The human eye and camera form small, inverted, real images on the retina and film, respectively. Microscopes use two lenses to magnify small objects, forming an enlarged final image for viewing. Telescopes similarly use two lenses to make distant objects appear larger. The module aims to explain how these optical devices work and form images.
optical assistive devices for vision impairement in nearSrijana Lamichhane
This document discusses various optical assistive devices for near vision impairment. It begins with an introduction to visual impairment and classifications. It then discusses epidemiology of near vision impairment globally. The document defines assistive devices and technologies. It discusses different types of low vision magnification including relative size, relative distance, angular, and projection magnification. It provides examples of calculating equivalent viewing power and distance. Finally, it describes various near optical devices like telescopes, magnifiers, and electronic devices and provides examples of their use.
The slit lamp allows examination of the anterior segment of the eye and provides magnified views. It has three main components: an illumination system using a slit beam of light, an observation system with microscope, and a mechanical system. Different illumination techniques like diffuse, direct, retroillumination are used to examine various structures. The slit lamp is used for diagnostic evaluation of many anterior segment diseases and procedures like gonioscopy, pachymetry and contact lens fitting. It provides detailed examination of structures like cornea, iris, angle and anterior chamber.
Myopia (nearsightedness) causes distant objects to appear blurred as the image forms in front of the retina. It is caused by excessive curvature of the cornea or elongation of the eyeball. Myopia can be corrected using a concave lens. Hypermetropia (farsightedness) causes near objects to appear blurred as the image forms behind the retina. It is caused by the focal length of the lens being too great or the eyeball being too short. Hypermetropia can be corrected using a convex lens. Presbyopia is a progressive form of farsightedness that affects most people in their early 60s as the power of accommodation decreases with age. Astigmatism
Camera for Dentistry- Should I Invest One in My Dental ClinicPremiereDental
As the world of dentistry continues to evolve, taking pictures for documentation and treatment purposes has evolved greatly from merely clicking a camera at a patient’s teeth, to getting accurate visual information on everything that goes on in a patient’s mouth, be it the different contours of the centra incisors to the angle of an impacted wisdom tooth.
Acquiring such information from a picture however requires a camera that allows such precise details to be highlighted. With the ever improving technology in dental photography, clinics should consider the following before purchasing a dental camera.
Eye defects can be present from birth or develop later in life, with some like myopia and farsightedness being very common. Myopia occurs when the eye is too long or the cornea is too curved, causing near objects to be in focus while distant objects are blurred. Farsightedness happens when the eye is too short or the lens is too weak, making near objects blurred but distant objects clear. Other defects include presbyopia from weakening eye muscles with age, and astigmatism from an irregular cornea shape distorting vision. Many common eye defects can be treated with corrective lenses.
Slit lamps are used to carefully examine the cornea, conjunctiva, and lids of the anterior eye segment. The microscope and light source are coupled so that the same part of the eye being examined is illuminated. This coupling facilitates examination. Main components include the slit lamp microscopes, illumination systems, and mechanical coupling. Attachments allow for fundus examination, gonioscopy, tonometry, laser photocoagulation, and measuring visual acuity in patients with hazy media. Magnification typically ranges from 6x to 40x.
This document discusses the two main types of vision defects: myopia and hypermetropia. Myopia, or nearsightedness, causes images to focus in front of the retina, making distant objects blurry. It is caused by an elongated eyeball or decreased lens focal length. Hypermetropia, or farsightedness, causes images to focus behind the retina, making near objects blurry. It is caused by a shortened eyeball or increased lens focal length. Both conditions are corrected using corrective lenses - concave lenses for myopia and convex lenses for hypermetropia. Diagrams are provided to illustrate image formation and correction in normal, myopic, and hypermetropic eyes.
A lens works by refracting light as it passes from one medium to another. The most common types of lenses are biconvex and biconcave lenses. Biconvex lenses are converging lenses that form real images, while biconcave lenses are diverging lenses that form virtual images. Different types of lenses include wide-angle lenses, normal lenses, telephoto lenses, macro lenses, and specialty lenses like fisheye lenses. Proper lens selection and care is important to avoid damage from dirt, scratches, shocks, and water.
This slide gives you the basic information about the types of photography lenses used worldwide.
Image source: Google Images
*the content provided here has been copied from various sources. no authentication proof is available.
Digital photography /certified fixed orthodontic courses by Indian dental ac...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Magnifiers is a type of magnifying glass or lens.
It consists of high convex lens.
It is mounted on a frame with handle or without handle.
Magnifiers mostly used in low vision patients.
Magnifiers are of 5 types available;
1. Hand magnifiers
2. Spectacle magnifier
3. Stand magnifier
4. Telescopic magnifier
5. CCTV
These types of magnifiers details in this pdf.
THANK YOU..
The slit lamp is an instrument used to conduct biomicroscopy of the anterior segment of the eye. It consists of an observation system including eyepieces and objectives, an illumination system to illuminate the eye, and a mechanical support system. Various models exist with different configurations such as the Czapski scope with rotating objectives or zoom systems. The slit lamp can be used to examine the eyelids, conjunctiva, cornea, anterior chamber, iris, lens and vitreous humor. Different illumination techniques such as diffuse, direct focal, indirect, retroillumination and specular reflection allow visualization of different ocular structures. The slit lamp is useful for procedures such as foreign body removal and contact lens fitting examinations.
For the full video of this presentation, please visit:
https://www.edge-ai-vision.com/2021/02/eye-tracking-for-the-future-a-presentation-from-parallel-rules/
Peter Milford, President of Parallel Rules, presents the “Eye Tracking for the Future” tutorial at the September 2020 Embedded Vision Summit.
Eye tracking is an increasingly important technology for applications ranging from augmented and virtual reality head-mounted displays to automotive driver monitoring. In this talk, Milford introduces eye tracking techniques and technical challenges. He also explores camera and computational requirements for eye tracking, and highlights selected use cases and applications.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The document compares how the eye and camera work to form images. Both have a lens that allows light to pass through and hit a light-sensitive surface - the retina in the eye and the image sensor in the camera - which records the light patterns to create the image. While the eye instantly processes images, the camera is able to retain much more visual detail by using a shutter release button to capture images.
The human eye allows us to see by allowing light to enter through the cornea and lens, which focuses the light onto the retina. The lens adjusts its curvature, a process called accommodation, to focus on objects at different distances, with the help of ciliary muscles. The retina contains light-sensitive cells that detect the image and send signals to the brain via the optic nerve. Some common vision problems include myopia, where the eye focuses images in front of the retina, hypermetropia where images are focused behind the retina, and presbyopia which occurs due to weakening muscles with age.
Visual impairment and low vision can be caused by eye diseases, accidents, or conditions present from birth. It affects a person's ability to see clearly or fully. Visual acuity tests measure sharpness of vision and is recorded as a fraction where the top number is the distance and bottom is the font size seen clearly. Normal vision is 20/20. Low vision is defined as visual acuity between 20/70 and 20/200 or visual field less than 20 degrees, even with correction. Devices like magnifiers, telescopes and electronic magnifiers can help those with low vision maximize their remaining sight.
This document discusses low vision aids and their use for people with visual impairments. It defines low vision according to the WHO and describes common causes of visual dysfunction like macular degeneration and glaucoma. The goals of low vision rehabilitation are to maintain and improve visual function through clinical assessment and optometric intervention. Low vision aids can be optical devices like magnifying glasses, telescopes, or non-optical devices that alter lighting, contrast and size of objects. Common optical devices discussed include magnifying spectacles, hand magnifiers, stand magnifiers, and telescopes.
The document discusses the structure and function of the human eye. It describes how light enters through the cornea and pupil, and is focused onto the retina by the lens. The retina contains light-sensitive rod and cone cells which convert light into electrical signals sent to the brain via the optic nerve. Common eye diseases like myopia, hyperopia, astigmatism, glaucoma and cataracts are also outlined, as well as modern vision correction methods like contact lenses and LASIK surgery.
These lectures has prepared for postgraduate student (Ophthalmology) according to the curriculum of Bangladesh College of Physician and Surgeons (BCPS) and Bangabondhu Sheikh Mujib Medical University (BSMMU) Bangladesh
Focal length signifies the distance from the optical center of the lens to the image sensor of your camera and is measured in millimeters. The lens' focal length determines how large the object will appear in the frame and how wide the lens' angle of view will be.
This module discusses optical instruments. It covers the human eye, cameras, microscopes, telescopes, and holograms. The human eye and camera form small, inverted, real images on the retina and film, respectively. Microscopes use two lenses to magnify small objects, forming an enlarged final image for viewing. Telescopes similarly use two lenses to make distant objects appear larger. The module aims to explain how these optical devices work and form images.
optical assistive devices for vision impairement in nearSrijana Lamichhane
This document discusses various optical assistive devices for near vision impairment. It begins with an introduction to visual impairment and classifications. It then discusses epidemiology of near vision impairment globally. The document defines assistive devices and technologies. It discusses different types of low vision magnification including relative size, relative distance, angular, and projection magnification. It provides examples of calculating equivalent viewing power and distance. Finally, it describes various near optical devices like telescopes, magnifiers, and electronic devices and provides examples of their use.
The slit lamp allows examination of the anterior segment of the eye and provides magnified views. It has three main components: an illumination system using a slit beam of light, an observation system with microscope, and a mechanical system. Different illumination techniques like diffuse, direct, retroillumination are used to examine various structures. The slit lamp is used for diagnostic evaluation of many anterior segment diseases and procedures like gonioscopy, pachymetry and contact lens fitting. It provides detailed examination of structures like cornea, iris, angle and anterior chamber.
Myopia (nearsightedness) causes distant objects to appear blurred as the image forms in front of the retina. It is caused by excessive curvature of the cornea or elongation of the eyeball. Myopia can be corrected using a concave lens. Hypermetropia (farsightedness) causes near objects to appear blurred as the image forms behind the retina. It is caused by the focal length of the lens being too great or the eyeball being too short. Hypermetropia can be corrected using a convex lens. Presbyopia is a progressive form of farsightedness that affects most people in their early 60s as the power of accommodation decreases with age. Astigmatism
Camera for Dentistry- Should I Invest One in My Dental ClinicPremiereDental
As the world of dentistry continues to evolve, taking pictures for documentation and treatment purposes has evolved greatly from merely clicking a camera at a patient’s teeth, to getting accurate visual information on everything that goes on in a patient’s mouth, be it the different contours of the centra incisors to the angle of an impacted wisdom tooth.
Acquiring such information from a picture however requires a camera that allows such precise details to be highlighted. With the ever improving technology in dental photography, clinics should consider the following before purchasing a dental camera.
Eye defects can be present from birth or develop later in life, with some like myopia and farsightedness being very common. Myopia occurs when the eye is too long or the cornea is too curved, causing near objects to be in focus while distant objects are blurred. Farsightedness happens when the eye is too short or the lens is too weak, making near objects blurred but distant objects clear. Other defects include presbyopia from weakening eye muscles with age, and astigmatism from an irregular cornea shape distorting vision. Many common eye defects can be treated with corrective lenses.
Slit lamps are used to carefully examine the cornea, conjunctiva, and lids of the anterior eye segment. The microscope and light source are coupled so that the same part of the eye being examined is illuminated. This coupling facilitates examination. Main components include the slit lamp microscopes, illumination systems, and mechanical coupling. Attachments allow for fundus examination, gonioscopy, tonometry, laser photocoagulation, and measuring visual acuity in patients with hazy media. Magnification typically ranges from 6x to 40x.
This document discusses the two main types of vision defects: myopia and hypermetropia. Myopia, or nearsightedness, causes images to focus in front of the retina, making distant objects blurry. It is caused by an elongated eyeball or decreased lens focal length. Hypermetropia, or farsightedness, causes images to focus behind the retina, making near objects blurry. It is caused by a shortened eyeball or increased lens focal length. Both conditions are corrected using corrective lenses - concave lenses for myopia and convex lenses for hypermetropia. Diagrams are provided to illustrate image formation and correction in normal, myopic, and hypermetropic eyes.
A lens works by refracting light as it passes from one medium to another. The most common types of lenses are biconvex and biconcave lenses. Biconvex lenses are converging lenses that form real images, while biconcave lenses are diverging lenses that form virtual images. Different types of lenses include wide-angle lenses, normal lenses, telephoto lenses, macro lenses, and specialty lenses like fisheye lenses. Proper lens selection and care is important to avoid damage from dirt, scratches, shocks, and water.
This slide gives you the basic information about the types of photography lenses used worldwide.
Image source: Google Images
*the content provided here has been copied from various sources. no authentication proof is available.
The lenses used for photography worldwideAmit Dash
This slide gives you the basic information about the types of photography lenses used worldwide.
Image source: Google Images
*the content provided here has been copied from various sources. no authentication proof is available.
Camera lenses come in a variety of types to suit different photographic needs. The major types of digital camera lenses are standard lenses, macro lenses, telephoto lenses, wide angle lenses, specialist lenses, and kit lenses. Standard lenses have a mid-range focal length similar to human vision. Macro lenses are designed for close-up photography while telephoto lenses provide magnification for distant subjects. Wide angle lenses capture a wider field of view and fisheye lenses use strong distortion. Specialist lenses create specific effects while kit lenses are basic lenses bundled with entry-level cameras. The type of lens used depends on the subject and photographic goals.
Today there are tons of questions to buy a right DSLR because its one time purchasing and its also very costly so i came with a new article of best buying trips .
This document provides an overview of lens fundamentals and creative techniques for photographers using DSLR cameras. It explains focal length and how different lenses can include wider or narrower views. Aperture is discussed, including how wide apertures allow faster shutter speeds for low light or action shots, while small apertures enable slow shutter speeds for blurring movement. Depth of field is covered, specifically how focal length, aperture, and focus distance impact the area of the image that appears sharp versus blurred. The guide aims to help photographers better understand and control their lenses to take more creative photos.
Magnification is a method of increasing the size of the image
so that enough of the retina is stimulated to send an impulse
through the optic nerve allowing an object to be perceived .
Digital cameras take pictures digitally by recording images via an electronic image sensor rather than using film. They have advantages over film cameras like immediately viewing photos, storing thousands of photos on memory, and deleting photos to free space. Digital cameras come in various sizes and prices, from small point-and-shoot compact cameras to high-end professional DSLR cameras with interchangeable lenses. Compact cameras are designed to be tiny, portable, and easy to use, while sacrificing some picture quality. DSLRs have large image sensors and interchangeable lenses, allowing professional-quality photos.
The document provides instructions for properly using Celestron binoculars. It explains how to adjust the interpupillary distance and focus by moving the eyepieces and focusing wheel. The document also recommends keeping the optics clean and warns not to view the sun, as it can damage eyes. Users should contact customer service if any warranty or repair issues arise.
This document provides tips and techniques for using lenses creatively on a DSLR camera. It begins with explanations of key lens concepts like focal length, aperture, and depth of field. Wide angle lenses capture more of a scene while telephoto lenses provide magnification. Wide apertures allow faster shutter speeds for low light but shallow depth of field, while small apertures provide greater depth of field but require slower shutter speeds. The document encourages experimenting with different focal lengths, apertures, and perspectives to take photos in a more creative and intentional manner.
Catalog VORTEX All About Optics | Optics Trade | 2014Optics-Trade
This document provides information about optics and factors to consider when choosing optics. It discusses how quality optical glass and advanced lens coatings can provide clearer, sharper images. Specifications like eye relief, field of view, exit pupil, and resolution are explained to help determine if optics are suitable for their intended use. Higher quality materials and design tolerances may cost more initially but provide better performance and reliability.
All through my school and college life, i had 1 problem... i could not cheat... i was scared to look into the paper of the person sitting next to me... hence, i always wished there was a fool proof way of cheating... i thought it would be nice to flip through pages and find information right there in the brain... thaz when i thought of a product called cheat lenses... now, i am pursuing my MBA and was given an assignment to come up with an innovative product... and suddenly, i remembered about my wishlist of things i wish existed... and right there at the top was cheat lenses.. so i did a lot of googling (if that is a word) and tried to find out if the product exist... When i was sure, that it does not exist... i went ahead with the project: Cheat Lenses... to fill up the slides... i searched info on contacts... so, most info present till slide 7 is from wiki... and then my brain starts!!!
i enjoyed making the presentation... i hope you will enjoy reading the same! Also, i renamed my product from cheat lenses to empowered lenses because according to our sales management teacher and our marketing management teacher, we should not use negative words while trying to sell a product... so read on to find out how my imaginary cheat lenses can empower you!!! I sincerely believe that this product should be brought into existence... Hello Mr. Scientist... do you hear my plea???
This document discusses low vision aids for people with vision that cannot be improved through glasses, medicine, or surgery. It defines low vision as visual acuity of 6/60 or less, or a visual field of 20 degrees or less. It describes various types of low vision aids including magnifiers, filters, telescopes, and electronic devices that help improve vision by increasing size, contrast or field of view for activities like reading or distance viewing. It notes challenges of some aids like limited field or depth perception and discusses fitting the correct aid based on a person's visual needs and acuity.
This document provides 10 tips for taking better photos with a digital camera, beginning with using the camera's settings to warm tones and reduce glare, using flash to illuminate outdoor portraits, using macro mode for close-ups, ensuring level horizons, using large memory cards, adjusting resolution based on intended use, using a tripod or self-timer for stability, and exploiting long exposures to capture motion in water or other scenes. The key message is that digital cameras alone do not make great photos and that skillful use of settings and techniques is important to get the best results.
Various laser lenses have been introduced following Goldmann 3- mirror and Goldmann fundus contact lens for retinal photocoagulation.
Below described some of the time-tested lenses in widespread use. Precise knowledge of these lenses is necessary for safe retinal photocoagulation.
This document discusses visual disorders and low vision. It defines different levels of visual impairment from moderate to profound based on best corrected visual acuity and visual field diameter. Causes of low vision including various eye diseases are described. Methods of low vision evaluation and different low vision devices like magnifiers, telescopes, electronic devices are explained. Low vision rehabilitation strategies including use of assistive devices and training are also summarized.
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
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Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
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20240605 QFM017 Machine Intelligence Reading List May 2024
Binoculars
1. Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical
telescopes mounted side-by-side and aligned to point accurately in the same direction,
allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most
are sized to be held using both hands, although sizes vary widely from opera glasses to large
pedestal mounted military models. Many different abbreviations are used for binoculars,
including glasses, nocks, oculars', binos and bins.
Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer
objects the two views, presented to each of the viewer's eyes from slightly different
viewpoints, produce a merged view with an impression of depth.
Binoculars to be used to view objects that are not at a fixed distance must have a focusing
arrangement which changes the distance between ocular and objective lenses. Traditionally,
two different arrangements have been used to provide focus. Binoculars with "independent
focus" require the two telescopes to be focused independently by adjusting each eyepiece.
Binoculars designed for heavy field use, such as military applications, traditionally have used
independent focusing. Because general users find it more convenient to focus both tubes
with one adjustment action, a second type of binoculars incorporates "central focusing",
which involves rotation of a central focusing wheel to adjust both tubes together. In
addition, one of the two eyepieces can be further adjusted to compensate for differences
between the viewer's eyes (usually by rotating the eyepiece in its mount). Because the focal
change effected by the adjustable eyepiece can be measured in the customary unit of
refractive power, the diopter, the adjustable eyepiece itself is often called a "diopter". Once
this adjustment has been made for a given viewer, the binoculars can be refocused on an
object at a different distance by using the focusing wheel to move both tubes together
without eyepiece readjustment. Most modern binoculars are also adjustable via a hinged
construction that enables the distance between the two telescope halves to be adjusted to
accommodate viewers with different eye separation. Most are optimized for the
interpupillary distance (typically 56mm) for adults.
There are "focus-free" or "fixed-focus" binoculars that have no focusing mechanism. They
are designed to have a fixed depth of field from a relatively close distance to infinity, having
a large hyper focal distance. These are considered to be compromise designs, suited for
convenience, but not well suited for work that falls outside their designed range.
Some binoculars have adjustable magnification, zoom binoculars, intended to give the user
the flexibility of having a single pair of binoculars with a wide range of magnifications,
usually by moving a "zoom" lever. This is accomplished by a complex series of adjusting
lenses similar to a zoom camera lens. These designs are noted to be a compromise and even
a gimmick since they add bulk, complexity and fragility to the binocular. The complex optical
path also leads to a narrow field of view and a large drop in brightness at high zoom. Models
also have to match the magnification for both eyes throughout the zoom range and hold
collimation to avoid eye strain and fatigue.
Night glasses are telescopes or binoculars with a large diameter objective. Large lenses can
gather and concentrate light, thus intensifying light with purely optical means and enabling
the user to see better in the dark than with the naked eye alone. Often night glasses also
2. have a fairly large exit pupil of 7 mm or more to let all gathered light into the user's eye.
However, many people can't take advantage of this because of the limited dilation of the
human pupil. To overcome this, soldiers were sometimes issued atropine eye drops to dilate
pupils. Before the introduction of image intensifiers, night glasses were the only method of
night vision, and thus were widely utilized, especially at sea. Second World War era night
glasses usually had a lens diameter of 56 mm or more with magnification of seven or eight.
Major drawbacks of night glasses are their large size and weight.
Digital camera binoculars are binoculars with digital camera capabilities. In these, the digital
binocular camera is situated on top and takes a photograph or a video of the view that is
seen through the binoculars. There is an LCD screen, either flat or flip-up, which allows the
users to frame the picture or video to be taken and review it afterward; the flip-up version is
generally the more convenient one.
Given the differences between the human eye and the camera lens, it is necessary to keep in
mind that the photographed or recorded view may not be exactly as the one seen through
the digital camera binocular eye-piece. The photo and video quality depends on how basic
or advanced the digital camera binoculars are, specifically on what the magnification is as
well as the size of the lens. These two factors are indicated by the binocular numbers, for
instance 8 by 42, where 8 is the magnification and 42 is the lens size. The larger the lens size,
the better the image. In advanced digital camera binoculars, the binocular numbers are large
and the photographs taken are good enough to be printed out.
Many binoculars with digital cameras only have limited storage space on their internal
memory. Once this memory gets full, if the digital camera binocular is to be used again, the
photographs and videos taken have to be either deleted or transferred elsewhere. They can
be downloaded onto a computer or stored on memory cards or on external memory drives.
In some cases, they can even be directly emailed or sent to an online photo site.
Usually, all digital camera binoculars come with image manipulation software that allows
users to re-size and adjust the downloaded photographs. Other general accessories can
include AAA batteries, USB cable, neck strap and tripod mounts. The last is particularly
useful for avoiding the pitfalls of handheld tremors in photographs and videos. Some digital
camera binoculars models have fold-down rubber eye-cups to make viewing easier for
people who wear glasses.
Binoculars with digital camera are popular with hikers, bird-watchers, nature researchers
and sports enthusiasts, among others. The basic, inexpensive digital camera binoculars,
however, are not well-suited for any in-depth observation. For serious study, it is necessary
to get the advanced digital camera binocular models that come with special close-focus and
magnification capabilities. Bird-watchers can train such models on birds, zoom in, and
capture specific bird behaviors instantly. Sports enthusiasts too can follow the action closely
and preserve the memorable moments.
3. Be it a concert, the Kentucky Derby, a political rally, football game or the opera, binoculars
can come in handy for just about any occasion where getting a closer view of an event is
needed. For these kinds of events, compact binoculars are ideal – small, robust, and
designed to fit into a handbag or jacket pocket. Compact binoculars are unobtrusive and
low-key, and do not need to be as robust or specialized as their hunting, birding or marine
cousins - although the basic principles behind them remain the same.
Like every other pair of binoculars, spectator binoculars consist of two identical, mirror-
symmetrical telescopes placed side-by-side and aligned together. This arrangement grants
observers an incredible depth of field and magnification while retaining the eye’s ability to
see objects in three dimensions, something which a monocular telescope is unable to do.
For most people, a pair of wide angle compact binoculars with magnifications levels that
range from 6x to 7x and objective lens sizes ranging from 25mm to 40mm should suffice.
Binoculars in this size range are normally lightweight, stable and easy to hold over long
periods of time. If you know you are likely to be seated, a set of binoculars with a
magnification of 10x will provide a crisp, close-up image of what you are trying to view. Try
not to go above 10x, as it will cause the image to suffer.
As you become more advanced and familiar with the use and handling of compact
binoculars you can begin to worry about things like magnification compared to objective
lens size. Objective lens size is a fairly simple choice to make - the larger the lens, the more
light will be collected and the sharper the final image will be. However, large lenses also
tends to lead to bulkier construction, and can be less manageable.
The best advice when buying compact binoculars is to use your own common sense and
judgment – how far away will you be from the stage or whatever you plan to look at? In a
standard concert hall, 10 x magnifications will probably be overkill. But if you were stood at
the back of the crowd at, say, President Osama's inauguration, then you may need the boost
to the viewing distance that a larger pair of binoculars can provide. If you pick a fairly mid-
powered pair of compact binoculars, the chances are that they will serve you well enough in
any given day-to-day situation.
Image-stabilized binoculars are binoculars that have a mechanism for decreasing the
apparent motion of the view due to binocular movement.
Image stabilized binoculars are designed to minimize image shaking in hand-held binoculars.
Higher power binoculars bring the image closer, but the image shift is also greater with even
smaller movement of your hands. Image stabilization technology in binoculars ensures
instant adjustment of the image to compensate for the motion. Major brands making image
stabilized binoculars include are Canon, Fujinon, Nikon, Carl Zeiss, and Bushnell.
Several different mechanisms have been used for image stabilization.
Binoculars with digital camera are the in thing as they can be used to take good pictures of
the objects that you are viewing. This helps as that will mean that you have the best of the
both the worlds. You get a good pair of binoculars as well you can have the best of the
4. pictures of the view that you were enjoying. That said there a few things that you need look
for the digital camera binoculars so that you derive the maximum benefit.
Digital camera binoculars have the optical zoom as well as the interpolation zoom. The
interpolation zoom is kind of a hypothetical zoom which assumes the image that you will see
and then gives you the result. The other one is the optical zoom which gives the actual zoom
of the binoculars and the camera that you will be able to view.
Always when reading the specifications of the binoculars with the built in digital camera you
can make sure that you have the optical zoom in mind. That way you can always get the
good digital binoculars or as people call it the dig bins.
Resolution of the camera is very important and that will mean that you be very careful about
what the specifications say. The digital cameras with low VGA are not very good. The low
VGA implies that you have the cameras with 1 mega pixel or less. That will not be very good
for picture quality but will be good for sending pictures via email.
Ideally you should be able to take small video clips using the digital camera. That will mean
that the digital camera that comes along with binoculars should have that capability to
replay the clips. A lot of binoculars come with the instant replay feature. Those binoculars
with instant replay feature are very good for seeing what you have shot and give you an
instant idea of the picture video quality. The best way to view these is to have the LCD
screen. Therefore now there are binoculars with LCD screens on them.
Another feature that should be there is the tripod adaptability. Taking pictures using the
tripod is a must so that you have the best of the pictures without the shakiness of the hand.
Make sure that those binoculars that you buy have a magnification of 8 or more. In fact
more is also not desirable as then binoculars can become heavy. Less is not desirable as then
you will not have good image quality.
Always make sure that the binoculars having a digital camera have a memory slot for an SD
card or MMC card. Most digital cameras with binoculars have the best the slot for the same
but again it is always better to make sure that it has one. Otherwise most of the inbuilt
memory is for 300 pictures approximately and then you will have to delete those or transfer
those to the PC.