Question about Photography
Inside the lens is an "iris" which allows you to adjust the effective diameter of the lens, and control how bright an image it casts on the film. This is controlled by the aperture ring.
Smaller number settings set a bigger hole in the iris and let more light in - allowing a shorter exposure time, but reducing your depth of field (so if you're focussed on an object at two metres, stuff at 1m or 4m might be blurred)
Larger number settings set a smaller hole and let less light in. This means longer exposures (and more risk of camera shake), but offers a better depth of field (so although you're focussed on something at 2m, objects much closer or further away are also more likely to appear shrp too.
Posted on Feb 03, 2008
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Posted on Jan 02, 2017
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