Sigma 18-35mm F1.8 DC 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.
Sigma 18-35mm F1.8 DC 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
Max sensor coverage of Sigma 18-35mm F1.8 DC HSM is APS-C / DX
Sigma 18-35mm F1.8 DC HSM has a focal range of 18-35mm and 1.9X zoom ratio.
Optical Image Stabilization
Sigma 18-35mm F1.8 DC HSM doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Sigma 18-35mm F1.8 DC HSM features Rotary (internal)
zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compare to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.
Maximum Magnification Ratio
Sigma 18-35mm F1.8 DC HSM has a Max Magnification Ratio of 0.23x
and has a minimum focusing distance of 0.28m
Sigma 18-35mm F1.8 DC HSM is a fixed aperture lens with a constant max aperture of f1.8 from 18mm all the way to the 35mm .
Sigma 18-35mm F1.8 DC HSM's optical formula consists of 17 elements in 12 groups.