Pentax-DA645 HD 28-45mm f4.5 ED AW SR Lens

The Pentax 28 45mm f4.5 ED AW SR HD DA lens with 645 mount is an ultra wide angle lens with SR Shake Reduction for use with the 645D and 645Z medium format DSLR cameras. This weather resistant lens provides a 35mm equivalent focal length of 22 35.5mm, making it great for capturing a wide variety of scenes and subjects, in particular images with an exaggerated perspective. Its optics consists of 17 elements in 12 groups, including two high performance aspherical elements and two extra low dispersion elements. In addition, the Pentax innovated SR mechanism has been incorporated into this versatile lens, which effectively compensates for camera shake up to approximately 3.5 shutter stops.