Sigma 24-70mm F2.8 EX DG HSM is an Auto Focus (AF) Standard Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.
Sigma 24-70mm F2.8 EX DG HSM is compatible with cameras that have Pentax KAF3
lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are
Max sensor coverage of Sigma 24-70mm F2.8 EX DG HSM is 35mm FF
Sigma 24-70mm F2.8 EX DG HSM has a focal range of 24-70mm and 2.9X zoom ratio. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 36 - 105mm.
Optical Image Stabilization
Sigma 24-70mm F2.8 EX DG 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 24-70mm F2.8 EX DG 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 24-70mm F2.8 EX DG HSM has a Max Magnification Ratio of 0.19x
and has a minimum focusing distance of 0.38m
Sigma 24-70mm F2.8 EX DG HSM is a fixed aperture lens with a constant max aperture of f2.8 from 24mm all the way to the 70mm .
Sigma 24-70mm F2.8 EX DG HSM's optical formula consists of 14 elements in 12 groups.
**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.