Working to build up its lens line before the release of the forthcoming full-frame DSLR, Pentax has just announced a new standard K-mount zoom lens: the HD Pentax-D FA 24-70mm f/2.8ED SDM WR. This versatile wide-angle to medium telephoto lens packs in almost every one of Pentax’s library of optical technologies, including a Supersonic Direct-drive Motor (SDM) for fast, quiet, and accurate focusing, a constant f/2.8 aperture, and weather-resistant construction.
While optimized for full-frame sensors, the lens is just as useful on Pentax’s APS-C bodies, thanks to a 37-107mm equivalent focal length. Also, it contains three Extra-low Dispersion (ED) glass elements, three aspherical elements, and one anomalous dispersion glass mold aspherical lens into the 17-element / 12-group design, to minimize aberrations, correct distortion, and ensure high sharpness. This works in combination with the High Definition (HD) multi-layer coating that controls ghosting and flare for sharp, high-contrast images. Furthering image quality is the implementation of a rounded 9-blade aperture for smooth out-of-focus elements.
Heavy-duty construction has always been a staple of Pentax imaging products, and this lens is no exception. The barrel is built with five special seals for excellent weather resistance, preventing rain and moisture from entering the lens. The lens also has a tactile manual focus ring, which is accessible using the Quick-Shift Focus System, allowing photographers to simply twist the focus ring to switch from AF to MF. And, as an added touch, a zoom lock lever is available to prevent the lens from zooming out when not in use.
| Lens Mount | Pentax K / Full Frame |
| Focal Length (35mm Equivalent on APS-C) | 24-70mm (36-105mm) |
| Maximum Aperture | f/2.8 |
| Minimum Aperture | f/22 |
| Angle of View | 84° - 34.5° |
| Minimum Focusing Distance | 1.25' / 38 cm |
| Magnification | 0.20x |
| Lens Construction | 17 elements / 12 groups |
| Diaphragm Blades | 9, rounded |
| Filter Ring Diameter | 82mm |
| Dimensions | 3.5 x 4.3" / 88.5 x 109.5mm |
| Weight | 1.7 lb / 787 g |
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