Canon EF Mount Lens/APS-C Format, Fixed f/6.3 Aperture, 480mm (35mm Equivalent), Catadioptric Telephoto Lens, UMC Multi-Layer Anti-Reflective Coating A uniquely compact telephoto option this Reflex 300mm f/6.3 UMC CS Lens from Samyang is a mirror lens specifically designed for APS ...Canon EF Mount Lens/APS-C Format, Fixed f/6.3 Aperture, 480mm (35mm Equivalent), Catadioptric Telephoto Lens, UMC Multi-Layer Anti-Reflective Coating A uniquely compact telephoto option this Reflex 300mm f/6.3 UMC CS Lens from Samyang is a mirror lens specifically designed for APS-C-format Canon EF mount DSLR cameras. Its Cassegrain design enables it to achieve a 480mm 35mm-equivalent focal length perspective within a sleek and lightweight lens design that is significantly smaller than a traditional 300mm lens. An Ultra Multi Coating (UMC) has been applied to the eight-element-in-eight-groups lens construction in order to minimize surface reflections and ghosting for more contrast-rich imagery.
Additionally the reflex lens design also helps to nearly eliminate chromatic aberrations for greater clarity and color accuracy around subject edges. It features a fixed f/6.3 aperture and manually focuses as closely as 3.6'.