What is the meaning of F4-5 6 in a specification of a lens? - Quora
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what does this symbol mean on the Nikon F : r/vintagecameras
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What do the numbers on your lens mean?
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f-number - Wikipedia
f-number - Wikipedia
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What does F mean in photography? - Quora
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terminology - What do the F and f numbers written on lens mean? - Photography Stack Exchange
What is Aperture? Understanding Aperture in Photography
What is Aperture? Understanding Aperture in Photography
