For a given film type, shutter speed and aperture, how do I calculate the light needed to get a good exposure? For example, if I use a f/8 aperture, an exposure time of 100 ms and a ISO 800-film ...
Possible Duplicates: What exactly determines depth of field? Technically, why is the out of focus area blurred more when using a bigger aperture? It is obvious that the aperture affects ...