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 that are compatible with the Pentax KAF3 lenses are , and .
Focal Range
Pentax DA 20-40mm F2.8-4 ED DC WR has a focal range of 20-40mm and 2.0X zoom ratio which has a 35mm equivalent focal range of 30-60mm when used on a APS-C / DX format camera.
Weather Sealings
Pentax DA 20-40mm F2.8-4 ED DC WR is a weather sealed lens which provides an extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have an effective protection, you have to pair the Pentax DA 20-40mm F2.8-4 ED DC WR with a weather sealed camera body such as , and .
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).
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.
Maximum Magnification Ratio
Pentax DA 20-40mm F2.8-4 ED DC WR has a Max Magnification Ratio of 0.2x and has a minimum focusing distance of 0.28m.
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 . Following special elements are used in this design:
- 1 ED glass element
- 1 SLD glass element
- HD coating
Lens Hood
Pentax DA 20-40mm F2.8-4 ED DC WR comes with a removable lens hood which is handy to reduce lens flare and glare in your photos. The model number of the hood is MH-RA55.
Body Colour
Pentax DA 20-40mm F2.8-4 ED DC WR is available in Black and silver color.
Popular Comparisons of Pentax DA 20-40mm F2.8-4 ED DC WR
Here is the eight most popular comparisons of Pentax DA 20-40mm F2.8-4 ED DC WR amongst Camera Decision readers.