f-number - Wikipedia

What is the sweet spot (sharpest) aperture for a 50mm 1.4 STM lens

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Aperture, f-Stops, and the U.S. System

Numerical aperture - Wikipedia

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If I have a micro 4/3 camera, will a 1.7 lens basically be a 3.4

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What's the F-number of the Human Eye?

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f-number - Wikiwand