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Absolute and relative lens apertures
How Aperture Works | HowStuffWorks
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Absolute and relative lens apertures
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What is the difference between focal length and aperture? - Quora
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Formats and Focal Lengths
Aperture - Wikipedia
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What is Focal Length in Photography? - Focal Length Explained
What is Focal Length in Photography? - Focal Length Explained
Focusing Basics | Aperture and Depth of Field
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Focal Length and Aperture Explained for the Photography Novice – Digital Photography Tutorials
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