The silver 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.
Focal Length | 20 to 40mm (35mm Equivalent Focal Length: 30.5 to 61.5mm) |
Maximum Aperture | f/2.8 to 4 |
Minimum Aperture | f/22 to 32 |
Lens Mount | Pentax K |
Format Compatibility | APS-C |
Angle of View | 70° to 39° |
Minimum Focus Distance | 11.02" / 28 cm |
Maximum Magnification | 0.2x |
Optical Design | 9 Elements in 8 Groups |
Diaphragm Blades | 9 |
Focus Type | Autofocus |
Image Stabilization | None |
Filter Size | 55 mm (Front) |
Dimensions (ø x L) | 2.8 x 2.72" / 71 x 69 mm |
Weight | 9.98 oz / 283 g |
Package Weight | 1.105 lb |
Box Dimensions (LxWxH) | 6.15 x 4.05 x 3.95" |