Ok as promised A Guide To Stops..... Definition: A stop is one full click of the shutter speed or aperture opening. The most important property of a stop is it's ability to *double of half the amount of light* that reaches the film. Remember I asked you if your camera measured in 1/3 or 1/2 increments? If your camera measures in 1/3 increments 3 clicks will be a full stop. If your camera measures in 1/2 increments 2 clicks will be a full stop.

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