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17-40mm

New Canon EF 17-40mm F2.8-4 lens in the works?

Japanese site Egami seems to have discovered a Canon patent filing detailing a replacement for its 17-40mm F4 L USM zoom lens.

Sporting a brighter F2.8 to F4 variable aperture range, the new lens could enable users to capture sharper images in low-light conditions, due to a brighter F2.8 aperture at its 17mm wide end. This provides a one-stop improvement over its predecessor.

The Canon 17-40mm F4 L USM lens has always been one of Canon's most popular lenses, thanks to its constant F4 aperture and its ability to capture an ultrawide-angle perspective, when used on a … Read more

Pentax announces new 17-70mm f4 lens

Pentax has announced the release of the Pentax SMC DA 17-70mm f4 AL SDM lens for Pentax digital SLR cameras. First shown at PMA 2008, the 17-70mm lens has a constant aperture of f4 through the entire zoom range, with a working focal length of 26-107mm. It has Pentax's SDM system with built-in supersonic motor for quiet and responsive autofocusing when used on a compatible Pentax DSLR. The lens is compatible with the K20D, K200D, K100D Super, and K10D (with firmware 1.30 or later). When used on other Pentax bodies the focus is automatically switched to manual. Featuring … Read more