The camera obscura was made portable by the 1700s by putting it in a box with a pinhole on one side and a glass screen on the other. Light coming through this pinhole projected an image onto the glass screen, where the artist could easily trace it by hand. Artists soon discovered that they could obtain an even sharper image by using a small lens in place of the pinhole. For the birth of photography to happen two key discoveries were still needed: a way to combine light-sensitive material with the camera obscura device and a way to make an image permanent.
Photography - Technical Camera Controls
MAKING BEAUTIFUL PHOTOGRAPHS• National Geographic:http://video.nationalgeographic.com/video /player/photography/photographers/sim ply-beautiful.html
HOW DOES LIGHT TRAVEL THROUGH A CAMERA? C A B B C A
QUIZ1. What did artists use pre-1800’s to draw/trace with?2. What does light do to an image when it travels through a camera?3. In digital camera’s what reverses the image?4. In digital camera’s what does the photograph produce itself onto?
EXPOSURE TRIANGLE QUIZ1. Which component controls the grain?2. Which component controls the blur?3. Which component controls the Depth of Field?
ISO measures theISO sensitivity of the image sensor. ISO 100 ISO 3200
ISO AND NOISE• The lower the number (eg. 100) the finer/smoothe r the grain.• Meaning that the image will be higher quality.
ISO AND LIGHTThe higher the number (eg 1600) the more sensitive your camera is to light.Meaning more light is let onto the image but the quality is poor.
SHUTTER SPEED during which the camerato control the amount of timeis exposed to light.faster shutter speeds decrease the amount of light andfreeze the image.‘slower’ shutter speeds increase the amount of light andcan create movement in the image.
Shooting When shooting a landscape, get as much of thephotograph in sharp focus as possible (f11 to f22).In a portrait, shallower dof (f2.8 - 8) will isolate your subject from distracting backgrounds
QUIZ1. What F stop would you typically use when you shoot portraits?2. Give a numerical example of an F stop that creates a shallow depth of field.3. What could you photograph at F22?4. If you had F22 would more or less light come through the camera than F5.6?