This is a very odd zoom length for a cropped sensor unless Pentax intends to come out with a full frame camera.
RICOH IMAGING U.K LTD. is pleased to announce the launch of the HD PENTAX-DA 20-40mmF2.8-4ED Limited DC WR interchangeable lens, designed for use with PENTAX K-mount lens-interchangeable digital cameras. The first zoom lens in the acclaimed Limited Lens series, this zoom lens features a lens-installed AF driving motor and a dependable weather-resistant construction.
This is the first zoom lens of the high-performance Limited Lens series, providing exceptional visual description, distinctive appearance and a meticulously detailed finish. It features a two-times zoom range covering focal lengths from moderate wide angle to standard, and a large maximum aperture of F2.8 at its wide-angle end. In addition to the state-of-the-art HD coating and completely round-shaped diaphragm, it also comes equipped with a weather-resistant construction – a first for the Limited Lens series – and a smooth, quiet AF system driven by a lens-installed AF motor, to capture beautiful, high-quality images, even in demanding weather conditions.
1. The first two-times zoom lens in the Limited Lens series
With its two-times zoom coverage from 20mm to 40mm, this lens offers a focal-length coverage from 30.5mm to 61.5mm (in 35mm format) when mounted on a PENTAX K-series lens-interchangeable digital camera body. It provides the most frequently used focal lengths required for many popular applications, such as scenic photography, snapshots and portraiture, making it the ideal choice as an all-purpose, everyday lens.
2. Acclaimed Limited Lens-series quality for superb visual description and premium appearance
Inheriting the design concept of the Limited Lens series, this lens is designed with an optical construction that reproduces the feeling of depth while minimising astigmatism over the entire zoom range. It allows the photographer to optimise the subject’s visual description, by making its appearance softer at larger apertures and sharper at smaller apertures. Its lens barrel, hood and cap are made of a high-grade aluminium material, and are hand-machined for perfect proportions and beautiful texture. The zoom ring in the mid-section of the lens barrel features a series of grooves to facilitate zooming operation.
3. State-of-the-art optical technology
The lens has been treated with the PENTAX-developed HD coating*, a high-grade, multi-layer coating that reduces reflection in the visible light spectrum to less than 50 percent of that of conventional multi-layer coatings. This allows the user to capture crisp, high-contrast images free of flare and ghost images, even in adverse lighting conditions. 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.
* HD stands for High Resolution.
4. The first weather-resistant lens in the Limited Lens series
This 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 locations subject to spray or splashes.
5. Other features
- Smooth, quiet AF operation using a lens-installed AF driving motor
- Round-shaped diaphragm to produce a natural, beautiful bokeh (blur) effect, while minimising the streaking effect of point light sources
- 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
- SP (Super Protect) coating to keep the front surface free of dust and stains
- A choice of black or silver