Notes from my Canon Academy Photography Lecture in Dubai 2018

1. Understanding
the Digital
Camera
Basic B2

2. The camera Obscura
 Principle of a pinhole camera:
 Light rays from an object pass through a small hole to form an image on the sensor

3. How do digital cameras work?
Digital Cameras convert analog information (represented by a fluctuating
wave) into digital information (represented by ones and zeros, or bits).
CDs, DVDs, HDTV, MP3s and DVRs are all built around the same basic
process

4. What’s the difference b/w a digital camera and
a regular film camera?
• Film cameras depend on chemical and mechanical
processes
• Film cameras do not even need electricity
• Digital Cameras have a built in computer which
record images electronically

5. Digital Single-lens Reflex Camera, or DSLR, is a type of digital
camera that provides the capability of interchanging lenses
and wider photo-shooting options than normal consumer
cameras.
It serves the purpose of capturing images in digital format
A DSLR contains a photographic lens, a viewfinder, a shutter,
and an image sensor.
What is DSLR ?

6. Know your camera

7. What happens when a
Digital Cameras takes a picture?
Once a pic is taken the image /pic must be converted
into a form the computer recognizes…bits and bytes
A digital pic is just a long string of pixels …1s and 0s
• All of these pixels make up the image

8. Design of a DSLR
The photographic lens located in front of
the camera directs lights into the camera
body.
Light is then reflected by the mirror to the
pentaprism and finally travels to the
viewfinder where photographers can
observe the scene.
Notice that the mirror is flipped down and
the shutter covers the image sensor from
recording lights.
When DSLR is not Capturing Image

9. Design of a DSLR
When Capturing an Image
The image capturing process starts
when the shutter release button is
pressed.
Notice the mirror is flipped up from its
original position, allowing light to travel
to the sensor area.
The shutter that covers the image
sensor is now fully opened, and the
image sensor is exposed under light
and will be capturing the image.

10. To help the process along…
A Digital Cameras has different lenses that help focus the light
to create the image of a scene
A 35 mm camera would focus the light onto a piece of film….a
Digital Cameras focus the light onto a semi-conductor device
that records the light electronically
• A computer breaks this info down into digital data

11. Aperture
 Aperture is the hole through which light travels
it regulates the amount of light that passes to form the image

12. Focal length
 The focal length of the lens is the distance between the lens and the image
sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm,
50 mm, 200mm etc ..)

13. Specific Part
Sensor is the key device in DSLR, and serves
the same function of capturing images as
traditional films
Image sensor is basically a silicon chip
containing millions of light sensitive element
called photo site, and is covered by a layer of
color filtermag
The Image Sensor – The Introduction

14. What breaks down the info
into digital data?
A sensor converts the light into electrical charges
Digital Cameras use CCDs (Charged Couple
Devices) or CMOS (Complementary Metal Oxide
Semiconductor)
• Both convert light into electrons
• Value is read of each cell in the image
• Both operate similarly converting the light into
readable form

15. There are two common sizes of
image sensor used by DSLR.
35 size image sensor has a
dimension of 36mm × 24mm and
is also called the full-frame
sensor.
APS-C size image sensor has a
dimension of 22mm × 15mm.
The size of an image sensor has
no effect on the size of the
captured image, but affects the
size of scene that will be
captured.
The Image Sensor – The size
This diagram illustrates the different sizes of
scene that a full frame and an APS-C sensor
are able to capture. The gray circle indicates
the total view, or the field of view, of the
camera.
Specific Part

16. The crop factor is the ratio of the dimensions of a camera's imaging area
compared to a reference format:
The red box displays what a 24×36 mm
sensor would see. The blue box displays
what a 15×23 mm sensor would see.
Most digital single-lens reflex (DSLR)
cameras on the market have
reducedAPS- C-sized image
sensors:
Image formats

17. Practical

18. Mode dial

20. Quick mode

21. THANK YOU