Aperture & ISO (51379083938).jpg
Aperture is a hole or an opening through which light travels, human eye can change aperture from f/2.1 to f/8.3. Film speed (or ISO 5800) is the measure of a photographic film's sensitivity to light, ISO standards appeared in 1974.
Artist: Exey Panteleev from Moscow, Russia. License: CC BY 2.0. Source
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