I gotta say that photography is about capturing light...and there are lots of controls on the camera to modify that. The aperture of the camera..the time you expose the image, the speed of the film, or in digital, the sensitivity of the image sensor.
...And then there is the other side of the story--the light source.
Gosh, that equation has even more variability. You can modify the number of sources, where they are, what they are pointing to, the intensity of each, the color of each, ...and prolly more things.
just using a couple of flashes has changed the way I look at this mess.
