Pentax 17-70mm F4.0 AL SDM is an Auto Focus (AF) Standard Zoom
lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.
Pentax 17-70mm F4.0 AL SDM is compatible with cameras that have Pentax KAF3
lens mount. Some of the latest released cameras with Pentax KAF3 lens mount are
Max sensor coverage of Pentax 17-70mm F4.0 AL SDM is APS-C / DX
Pentax 17-70mm F4.0 AL SDM has a focal range of 17-70mm and 4.1X zoom ratio.
Optical Image Stabilization
Pentax 17-70mm F4.0 AL SDM 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).
Pentax 17-70mm F4.0 AL SDM is available in Black color.
Pentax 17-70mm F4.0 AL SDM 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.
Pentax 17-70mm F4.0 AL SDM is a fixed aperture lens with a constant max aperture of f4 from 17mm all the way to the 70mm .
Pentax 17-70mm F4.0 AL SDM's optical formula consists of 17 elements in 12 groups.