35 mm equivalent focal length - Wikipedia
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mmCalc on the App Store
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Equivalent Focal Length :: VIVOTEK ::
Equivalence Also Includes Aperture and ISO
Medium Format Lens vs 35mm lens focal lengths equivalencies
Equivalent Focal Length :: VIVOTEK ::
Experience adapting MF glass to Sony A7/NEX & focal length equivalents: Sony Alpha Full Frame E-mount Talk Forum: Digital Photography Review
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