Lens Summary
Brand: Pentax
Also Known As: Pentax 20-40mm f/2.8-4 ED
Lens Type: Zoom Lens
Format: APS-C / DX
Focus: Autofocus
Lens Mount: Pentax K
Release Date: 2013-11-06
MSRP Price: $796.95
Made in: Japan
Production Status: Discontinued
Lens Description: The HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens from Pentax is a high performance standard length zoom lens for K-mount APS-C cameras. Its 35mm focal length equivalency is 30.5-61.5mm providing a versatile and practical range for wide-angle to standard length shooting. It is the first zoom lens in the Pentax Limited Series line and brings with it a durable, weather-sealed body, HD lens coating and an optical design consisting of one ED element and one super-low dispersion element. The f/2.8-4 maximum aperture enables effective low light shooting and, at the wide-angle end, control over its shallow depth of field for images that place sharp focus on the subject with a pleasing out of focus background. An in-lens direct current (DC) focus motor provides smooth and quiet autofocus action and its Quick-Shift Focus System enables rapid shift from autofocus to manual focus mode. The lens barrel and the included hood are made from high-grade aluminum alloy, distance and depth of field scales are clearly marked on the barrel and a smooth rotating, knurled ring provides manual focus control. SP (Super Protect) coating on the front and rear lens elements repels dust, water and grease to help maintain peak performance.
Pentax HD PENTAX-DA 20-40mm f/2.8-4 ED Limited DC WR Specifications
Lens Specifications | |
---|---|
Lens Type | Zoom Lens |
Focal Length | 20-40mm |
Mount Type | Pentax K |
Format | APS-C / DX |
Compatible Format(s) | APS-C |
Compatible with Teleconverters | No |
Maximum Reproduction Ratio | 0.20x |
Shake Reduction (Image Stabilization) | No |
Aperture Information | |
Aperture Ring | No |
Maximim Aperture | f/2.8-4 |
Minimum Aperture | f/22-32 |
Maximum Angle of View (APS-C or smaller format) | 70° |
Minimum Angle of View (APS-C or smaller format) | 39° |
Optical Information | |
Lens Elements | 9 |
Lens Groups | 8 |
Diaphragm Blades | 9 (Rounded) |
Low Dispersion Glass Elements | 1 |
Extra-Low Dispersion Glass Elements | 1 |
HD Coating | Yes |
Fluorine Coating | Yes |
Focus Information | |
Focus | Autofocus |
Built-in Focus Motor | Yes |
Supersonic Direct-drive Motor (SDM) | Yes |
Minimum Focus Distance | 0.28m |
Filter Information | |
Filter Size | 55mm |
Accepts Filter Type | Screw-on |
Physical Characteristics | |
Weather / Dust Sealing | Yes |
Mount Material | Metal |
Dimensions | 71 x 69mm |
Weight | 283g |
Other Information | |
Available in Colors | Black |