This nice piece of program will calculate the appropriate camera settings to yield a correct exposure based on the given light conditions and film speed
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F-Stop and Shutter simulator
Really nice simulator with image samples for any given f-stop and shutter speeds.
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Shutter Speed Calculator
Use this program to Calculate action-stopping or blur-producing shutter speeds or the
blur rendered by a shutter speed .
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QuickTime VR Calculators
This page has some calculators to Determining the field of view from the lens focal length, Determining the tilt range for uncorrected panoramas, Determining tilt limits for asymmetrical panoramas etc
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Depth of Field Calculator
A really nice online DOF Calculator .
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See also: Photography Tips