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Sigma 500mm f/4.5 EX DG Apo HSM Lens for Pentax

The Sigma 500mm APO F4.5 EX DG Lens is a large aperture telephoto lens which can help you capture sharp images of fast-moving subjects. The Sigma 500mm EX DG auto focus telephoto lens incorporates two ELD (Extraordinary Low Dispersion) glass elements for maximum color correction and sharpness throughout the entire zoom range. This lens is specially coated to reduce flare and ghosting caused by reflection from the digital image sensor.The Sigma 500mm APO F4.5 EX DG Lens is designed for full frame digital SLR camerasThe Sigma 500mm EX DG APO lens is an apochromatic ultra-telephoto lens with a fast f/4.5 maximum apertureThe HSM (Hyper-Sonic Motor) offers a quiet and high-speed auto focusWith the addition of the optional Sigma APO 1.4x EX teleconverter, this lens can be converted into a 700mm f/6.3 MF ultra-telephoto lens, while the addition of the 2x teleconverter converts the lens into a 1000mm f/9 MF ultra-telephoto lensThe angle of view is 5ÂșThe filter holder used is 46mm rear drop-in which provides easy rotation of polarizing filtersIt includes soft case, lens hood, circular PL filter and is also equipped with a fixed tripod socketThis super telephoto lens is approximately 14 inches long, weighs about  109.7oz and is highly compact
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