PRODUCT FEATURES
·Pentax K Mount
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·30.5-61.5mm (35mm Equivalent)
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·Aperture Range: f/2.8-32
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·ED and Super-Low Dispersion Elements
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·High-Grade Multi-Layer HD Coating
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·Weather-Resistant Seals and SP Coating
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·Smooth & Quiet DC Auto Focus Motor
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·Quick-Shift Focus System
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·Rounded Nine-Blade Diaphragm
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·First Limited Series Zoom Lens
·OVERVIEWThe HD PENTAX-DA 20-40mm F2.8-4 ED Limited DC WR lens combines Ricoh Imaging’s optical technology and premium construction culminating in the production of rich images with exceptional visual description and meticulous finish in every detail.With its handy zoom range (30.5mm to 61.5mm in the 35mm format), it is the ideal everyday lens, offering the most frequently used focal lengths required for many popular applications, such as scenic photography, snapshots and portraiture.It features a bright F2.8 maximum aperture (at 20mm) and rounded diaphragm blades producing stunning bokeh. At higher aperture numbers, its superior optical design incorporates ED (Extra-low Dispersion) glass elements and a proprietary HD coating that delivers clear crisp, high contrast images free of flare and ghosting.It also features a lens-based direct current (DC) focusing motor providing quiet and smooth autofocus functionality.The first two-times zoom lens in the Limited Lens seriesWith its two-times zoom coverage from 20mm to 40mm, this lens offers a focal-length coverage from 30.5mm to 61.5mm (in the 35mm format) when mounted on a PENTAX K-mount interchangeable lens digital camera body. It delivers a convenient and useful focal length with standard to moderate wide-angle coverage, ideal for a wide variety of subjects and settings.Acclaimed Limited Lens-series quality for superb visual detail and premium appearanceInheriting the design concept of the Limited Lens series, this lens is designed with an optical construction that faithfully reproduces the feeling of depth while minimizing astigmatism over the entire zoom range. It allows the photographer to optimize the subject’s visual detail by making images softer at larger apertures and sharper at smaller apertures. Its lens barrel, hood and cap are made of a high-grade aluminum material, and hand-machined for perfect proportions and beautiful texture. Positioned in the mid-section of the lens barrel, the zoom ring features a series of knurled grooves to facilitate zooming operation.State-of-the-art optical technologyThe lens has been treated with the PENTAX-developed HD coating, a high-grade, multi-layer coating that reduces reflectance in the visible light spectrum to less than 50 percent of that of conventional multi-layer coatings, allowing the user to capture crisp, high-contrast images free of flare and ghost images, even under difficult lighting conditions such as backlight. It also incorporates an ED (Extra-low Dispersion) glass and a super-low-dispersion glass element in its optics to deliver clear, high-resolution images with edge-to-edge sharpness, while effectively compensating for chromatic aberrations over the entire zoom range.The first weather-resistant lens in the Limited Lens seriesThis lens is the first Limited Lens-series model to feature a weather-resistant construction, with seven special seals to prevent the intrusion of water and moisture into the lens interior. By mounting it on a PENTAX weather-resistant digital SLR camera body, the user is assured of greater durability and reliability when shooting in the rain or mist, as well as at locations subject to spray or splashes.Other features
·Smooth, quiet AF operation using a lens-installed AF driving motor.
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·Rounded diaphragm produces a natural, beautiful bokeh (blur) effect, while minimizing the streaking effect of point light sources.
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·The lens features the Quick-Shift Focus System, which allows the user to instantly switch to manual-focus operation after the subject is captured in focus by the camera’s AF system.
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·SP (Super Protect) coating to keep the front surface free of dust and stains.
·SPECIFICATIONSFocal Length 20-40mm
Lens Mount KAF3
Format Compatibility 35mm format equivalent 30.5-61.5mm
Aperture Maximum F2.8-4 Minimum F22-32
Lens Construction 9 elements in 8 groups
Angle of View 70-39°
Minimum Focusing Distance 0.28m (0.9 ft.)
Maximum Magnification 0.20×
Filter Diameter 55mm
Diaphragm Control Fully automatic
Number of Diaphragm Blades 9
Rounded aperture (20mm: F2.8-4 40mm: F4-5.6)
Dimensions D x L Approx.71mm x 68.5mm (2.8 inch x 2.7 inches)
Weight Approx.283g /10.0 oz (with hood Approx.291g /10.3 oz)