What is a camera?
It is a dark chamber with a hole in the front, with material at the back to capture the impression of light.
Anybody can make a camera, everybody has one. You can make one out of a tin can, you can make one out of a trash can. You can even make one out of an apartment. Even your eyes are chambers with holes.
The function of a camera is to creatively control how light will hit the back. Factors that affect how the back receives information are as follows.
- the brightness of the subject you are capturing
- how big the hole is (aperture)
- how light is filtered in front of the hole
- the amount of time you leave the hole open for (shutter speed
- how far away the hole is from the back (focal length)
- how sensitive the back material is (ISO)
- how light is focused and channeled (lens)
These are the basic concepts for what a camera is and how one functions.