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Forum: General Discussion Feb 18, 2007, 5:15 PM
Replies: 14
Views: 832
Posted By Corpsy
The f stop measurement is a ratio of the aperture...

The f stop measurement is a ratio of the aperture diamater to the focal length. So, if a 50mm lens has a 25mm aperture, that's a 1:2 aperture to focal length ratio, or f/2.

However, put that lens...
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