Fstop, Shutter Speed, ISO, and Other Silly Camera Numbers
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What is aperture? How, when, and why to use aperture
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What Is a Fast Lens, and What Goes into Designing One?
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Lens speed
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What is lens speed? Lens speed is related to f/stop. Learn why.
What Is a Fast Lens, and What Goes into Designing One?
Light Lens Lab 50mm f/2 "Speed Panchro II"
