Pentax FA 70-210mm F4 ED SDM WR is an Auto Focus (AF) Telephoto Zoom
lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF4 mount cameras.
Pentax FA 70-210mm F4 ED SDM WR is compatible with cameras that have Pentax KAF4
lens mount. Some of the latest released cameras with Pentax KAF4 lens mount are Pentax K-3 III
, Pentax KP
and Pentax K-70
Max sensor coverage of Pentax FA 70-210mm F4 ED SDM WR is APS-C / DX
Pentax FA 70-210mm F4 ED SDM WR has a focal range of 70-210mm and 3.0X zoom ratio.
Pentax FA 70-210mm F4 ED SDM WR is available in Black color.
Pentax FA 70-210mm F4 ED SDM WR 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 FA 70-210mm F4 ED SDM WR is a fixed aperture lens with a constant max aperture of f4 from 70mm all the way to the 210mm .
Pentax FA 70-210mm F4 ED SDM WR's optical formula consists of 20 elements in 14 groups. Following special elements are used in this design:
- 2 anomalous dispersion
- 3 ED elements + HD coating