Pentax DA 50-135mm F2.8 ED is an Auto Focus (AF) Telephoto Zoom
lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF2 mount cameras.
Pentax DA 50-135mm 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 DA 50-135mm F2.8 ED is APS-C / DX
Pentax DA 50-135mm F2.8 ED has a focal range of 50-135mm and 2.7X zoom ratio.
Optical Image Stabilization
Pentax DA 50-135mm 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 DA 50-135mm F2.8 ED is available in Black color.
Pentax DA 50-135mm F2.8 ED 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
Pentax DA 50-135mm F2.8 ED has a Max Magnification Ratio of 0.17x
and has a minimum focusing distance of 1m
Pentax DA 50-135mm F2.8 ED is a fixed aperture lens with a constant max aperture of f2.8 from 50mm all the way to the 135mm .
Pentax DA 50-135mm F2.8 ED's optical formula consists of 18 elements in 14 groups.