Pentax smc 16-50mm F2.8 ED is an Auto Focus (AF) Standard Zoom
lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF2 mount cameras.
Pentax smc 16-50mm F2.8 ED is compatible with cameras that have Pentax KAF2
lens mount. Some of the latest released cameras with Pentax KAF2 lens mount are
Max sensor coverage of Pentax smc 16-50mm F2.8 ED is APS-C / DX
Pentax smc 16-50mm F2.8 ED has a focal range of 16-50mm and 3.1X zoom ratio.
Optical Image Stabilization
Pentax smc 16-50mm F2.8 ED 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 smc 16-50mm F2.8 ED 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 smc 16-50mm F2.8 ED is a fixed aperture lens with a constant max aperture of f2.8 from 16mm all the way to the 50mm .
Pentax smc 16-50mm F2.8 ED's optical formula consists of 15 elements in 12 groups.