Pentax HD D-FA 645 90mm f/2.8 Macro ED AW SR Lens
When mounted on a PENTAX 645D medium-format digital SLR camera body, this medium-telephoto lens offers a focal length of approximately 71mm (or approximately 65mm when mounted on a PENTAX 645 film-format camera body) in the 35mm format. By incorporating two ED (extra-low dispersion) elements and one glass-moulded aspherical element in its optics, it assures high-resolution image reproduction over the entire image field, while effectively minimizing chromatic aberration, a problem commonly associated with fast lenses.
At larger apertures, this lens defines the subject with fine, delicate lines and soft, velvety edges. Coupled with a beautiful bokeh (out-of-focus rendition) effect created by a very shallow depth of field, it is an ideal lens for portrait photography. At smaller apertures, it produces sharp, solid images to make it useful for applications other than portraiture, such as scenic and still-life photography. It also offers macro photography at a maximum magnification of 0.5 times. In close-up applications, its floating mechanism effectively compensates for the curvature of the field to assure sharp, well-defined images.
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