Relative Aperture. The relative aperture, or f-stop, of a 23.5-mm diameter lens is
Chapter 2, Problem 22(choose chapter or problem)
Relative Aperture. The relative aperture, or f-stop, of a 23.5-mm diameter lens is directly proportional to the focal length F of the lens. If a 150-mm focal length has an f-stop of 6.3, find the f-stop of a 23.5-mm diameter lens with a focal length of 80 mm.
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