Why Is f/16 Smaller Than f/2? What Role Does Pi Play? And What’s Up With F/Stops, Anyway?

An aperture set at f/2 is twice as big as one set at f/2.8 and four times larger than f/4. What’s Pi got to do with f/stops, and why do we use such a seemingly arbitrary numbering system? Continue reading to learn the answers to these and a few more arcane aperture facts.

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