DSLR Camera Lens > Sigma
Photo © Sigma Corp. Courtesy of Sigma
The Sigma APO 70-200 F2.8 EX DG OS HSM is a large aperture, telephoto zoom lens that incorporates Sigma’s original Optical Stabilization (OS) function. The lens covers a medium telephoto range of focal lengths from 70mm to 200mm and has a large maximum aperture of F2.8 throughout the entire zoom range. The OS function offers the use of shutter speeds approximately four stops slower than would otherwise be possible.
For Sony and Pentax mounts, the built-in OS function of this lens can be used even if the camera body is equipped with an image sensor shift anti-shake system.
As compensation for camera shake is visible in the view finder, the photographer can easily check for accurate focus and ensure there is no subject movement. Two FLD glass elements, which have the performance equal to fluorite glass, and three SLD (Special Low Dispersion) glass elements should provide excellent correction of color aberration. High image quality is assured throughout the entire zoom range and an optimum optical power layout provides superior optical quality in all shooting ranges from close-up to infinity. Super Multi-Layer Coating reduces flare and ghosting.
This lens incorporates Hyper Sonic Motor (HSM), ensuring a quiet and high-speed auto focus, as well as full-time manual focus capability. The lens has a minimum focusing distance of 55.1 inches throughout the entire zoom range and a maximum magnification ratio of 1:8. The rounded, nine-blade diaphragm creates an attractive blur to the out of focus images.
This lens is equipped with a petal-type hood. For digital cameras with an APS-C size image sensor, a dedicated hood adapter, which expands the length of the lens hood, is supplied.
Other Sigma’s new lenses announced at PMA 2010 :
Sigma 17-50mm F2.8 EX DC OS HSM lens
Sigma APO 50-500mm F4.5-6.3 DG OS HSM lens
Sigma 85mm F1.4 EX DG HSM lens