Sigma AF APO 100-300mm F4 EX DG HSM Lens for Canon
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Item Description
This fast telephoto zoom lens maintains a large f/4 aperture at all focal lengths, providing excellent optical performance for Digital SLR cameras and film SLR cameras. The multi layer lens coating and lens design reduce flare and ghosting, while maintaining minimal light-fall-off and ensuring superior peripheral brightness. Four SLD (Special Low Dispersion) glass elements are used - two in the front lens group and two in the rear lens group - to provide correction of chromatic aberrations for superior image quality throughout the entire zoom range. Sigma's Hypersonic Motor (HSM) ensures a silent, high-speed AF function as well as full-time manual focusing capability for Sigma, Canon, and Nikon-D mount lenses. An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the petal-type lens hood supplied and circular polarizing filters. High-speed focusing is possible when this lens is used with optional, dedicated APO EX tele-converters (1.4x and 2x). With the optional 1.4x EX APO tele-converter, it works as an AF zoom lens from 140mm to 420mm at f/5.6. With the optional 2.0x EX APO tele-converter, it works as a manual focus zoom lens from 200mm to 600mm at f/8.
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