Focal length - Wikipedia
Focal length - Wikipedia
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Focal length - Wikipedia
File:Short focal length wide angle view.svg - Wikimedia Commons
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35 mm equivalent focal length - Wikipedia
File:A diagram representing a convex mirror, which shows its focal point, focal length, center of curvature, and the principal axis.png - Wikimedia Commons
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File:Focal-length-d.png - Wikimedia Commons
Focal Length - PanoTools.org Wiki
Talk:Focal length - Wikipedia
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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
