Pentax DA 20-40mm F2.8-4 ED DC WR 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.
Lens Mount
Pentax DA 20-40mm F2.8-4 ED DC WR is compatible with cameras that have Pentax KAF3 lens mount.Some of the latest released cameras with Pentax KAF3 lens mount are
,
and
.
Sensor Coverage
Max sensor coverage of Pentax DA 20-40mm F2.8-4 ED DC WR is APS-C / DX.
Focal Range
Pentax DA 20-40mm F2.8-4 ED DC WR has a focal range of 20-40mm and 2.0X zoom ratio.
Optical Image Stabilization
Pentax DA 20-40mm F2.8-4 ED DC WR 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).
Body Colour
Pentax DA 20-40mm F2.8-4 ED DC WR is available in Black and silver color.
Zoom Method
Pentax DA 20-40mm F2.8-4 ED DC 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.
Aperture
Pentax DA 20-40mm F2.8-4 ED DC WR is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 20mm, and a max aperture of f4 and minimum aperture of f32 at 40mm .
Optical Formula
Pentax DA 20-40mm F2.8-4 ED DC WR's optical formula consists of 9 elements in 8 groups.