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The word photography means "drawing with light". Controlling or selecting the light a camera records is essential to all aspects of photographic composition.

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How do I know how much light will be needed for a given film speed, shutter speed, and apert...

For a given film type, shutter speed and aperture, how do I calculate the light needed to get a good exposure? … I have read wikipedia's explanation of how light conditions relates to exposure, but I don't really understand it. All help is much appreciated! …
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How do I know how much light will be needed for a given film speed, shutter speed, and apert...

It plots the density of the silver halide in the film (i.e. how opaque the film is) as a function of the amount of light the film is exposed to (measured in log[lux * seconds]). … To get a "good" exposure, I probably need the amount of light that puts me in the middle of the curve. In the figure above that is -1.0 log[lux * seconds] which is the same as 0.37 lux*seconds. …
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