A telephoto lens with focal length of 123 mm has f-numbers
A telephoto lens with focal length of 123 mm has f-numbers ranging from f/2.8 to f/22.
What is the diameter of the lens aperture at the first f-number?
What is the diameter of the lens aperture at the second f-number?
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A telephoto lens with focal length of 123 mm has f-numbers ranging from f/2.8 to f/22. What is the diameter of the lens aperture at the second f-number
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