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.
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 with Sony Alpha lens mount 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. When mounted on a APS-C / DX format camera, it provides an 35mm (FF) equivalent of 25.5 - 75mm.
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
Rotary (extending)
Aperture
Sigma 17-50mm F2.8 EX DC OS HSM has a constant max aperture of f2.8 from 17mm all the way to the 50mm .