Sigma 17-50mm F2.8 EX DC OS HSM is an Auto Focus (AF) Standard Zoom lens with APS-C / DX max sensor coverage and it is designed to be used with Sony Alpha mount cameras.
Lenses in Sony Alpha Mount with Same Focal and Aperture Range
Lens Mount
Sigma 17-50mm F2.8 EX DC OS HSM is compatible with cameras that have
Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are
Sony A68,
Sony A77 II and
Sony A58.
Sensor Coverage
Max sensor coverage of Sigma 17-50mm F2.8 EX DC OS HSM is
APS-C / DX.
Focal Range
Sigma 17-50mm F2.8 EX DC OS HSM has a focal range of 17-50mm and 2.9X zoom ratio.
Optical Image Stabilization
Sigma 17-50mm F2.8 EX DC OS HSM features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.
Zoom Method
Sigma 17-50mm F2.8 EX DC OS HSM features
Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.
Maximum Magnification Ratio
Sigma 17-50mm F2.8 EX DC OS HSM has a Max Magnification Ratio of
0.2x and has a minimum focusing distance of
0.28m.
Aperture
Sigma 17-50mm F2.8 EX DC OS HSM is a fixed aperture lens with a constant max aperture of f2.8 from 17mm all the way to the 50mm .
Optical Formula
Sigma 17-50mm F2.8 EX DC OS HSM's optical formula consists of 17 elements in 13 groups.
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