Question about Photography
The number to which you refer is the relative aperture, or focal ratio. The value of the largest aperture available with a given lense. The larger the aperture, the more light and the ability to focus on closer subjects, at the sacrifice of depth of field. Smaller aperture lenses are more useful where closeup detail is not required. I hope that answers your question.
Posted on Jan 27, 2008
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Posted on Jan 02, 2017
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