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posted by Jason Kottke  ·  gift link

Twelve essential photographic facts, formulas, and rules

Twelve essential photographic facts, formulas, and rules of thumb.

Anatomical gray card. Metering off an 18-percent neutral gray card is a good way to get a midtone reading that will give you a good overall exposure of a scene. Forgot your gray card? Hold your open hand up so it’s facing the light, take a reading off your palm, open up one stop, and shoot. (Various skin tones rarely account for even a full-stop difference.)