Sunny 16

A light metering guideline that says proper exposure on a sunny day is f/16 at a shutter speed that is the reciprocal of your film speed.

For example, for a film speed of 100 ISO/ASA, 1/125 would be selected. For 200 ISO/ASA, 1/200 or 1/250, and so on. The closest match to the speed of the film to shutter speed being desired, depending on the speeds available.

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