Aperture - Wikipedia
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What does it mean when a lens is described as f5.6 or f1.8? How does this relate to an aperture number of the same value? - Quora
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What is Aperture? Understanding Aperture in Photography
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f-number - Wikipedia
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f/1.4 VS f/1.8 Can YOU Tell The Difference? (this will save you money) - YouTube
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What is Aperture? Understanding Aperture in Photography
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What does it mean when a lens is described as f5.6 or f1.8? How does this relate to an aperture number of the same value? - Quora
