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The Catadioptric (Mirror) design of the Rokinon Compact 300mm F6.3 significantly reduces the size and weight compared to traditional 300mm lenses and achieves: A 450mm (35mm-equivalent) focal length perspective on Full frame DSLRs (In crop sensor mode), APS-C DSLRs and APS-C Mirrorless cameras. A 600mm (35mm-equivalent) focal length perspective on 4/3 sensor (MFT mount) cameras. | Rokinon
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