Sigma 17-70mm F2.8-4 DC OS HSM C 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.
Lens Mount
Sigma 17-70mm F2.8-4 DC OS HSM C is compatible with cameras that have Sony Alpha lens mount.Some of the latest released cameras with Sony Alpha lens mount are
Sony A68,
Sony A77 II and
Sony A58.
Sensor Coverage
Max sensor coverage of Sigma 17-70mm F2.8-4 DC OS HSM C is APS-C / DX.
Focal Range
Sigma 17-70mm F2.8-4 DC OS HSM C has a focal range of 17-70mm and 4.1X zoom ratio. When mounted on a APS-C / DX format camera, it provides an 35mm (FF) equivalent of 25.5 - 105mm.
Optical Image Stabilization
Sigma 17-70mm F2.8-4 DC OS HSM C features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.
Zoom Method
Rotary (extending)
Aperture
Sigma 17-70mm F2.8-4 DC OS HSM C has a max aperture of f2.8 at 17mm and max aperture of f4 at 70mm .