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.
1. What did artists use pre-1800’s to
2. What does light do to an image when it
travels through a camera?
3. In digital camera’s what reverses the
4. In digital camera’s what does the
photograph produce itself onto?
EXPOSURE TRIANGLE QUIZ
1. Which component controls the grain?
2. Which component controls the blur?
3. Which component controls the Depth of
ISO measures the
sensitivity of the image
ISO 100 ISO 3200
ISO AND NOISE
• The lower the
r the grain.
• Meaning that
the image will
ISO AND LIGHT
The higher the number (eg 1600) the more sensitive your camera is
Meaning more light is let onto the image but the quality is poor.
to control the amount of time during which the camera
is exposed to light.
'faster' shutter speeds decrease the amount of light and
freeze the image.
‘slower’ shutter speeds increase the amount of light and
can create movement in the image.
When shooting a landscape, get as much of the
photograph in sharp focus as possible (f11 to f22).
In a portrait, shallower dof (f2.8 - 8) will isolate your
subject from distracting backgrounds
1. 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?