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Further, the lens features an angle of view from 31.5 degrees to 8.1 degrees (equivalent in focal length from 76.5mm to 306mm in the 35mm format). As with all DA-Series lenses, this DA 50mm-200mm features a responsive ?Quick-Shift Focus System? that allows photographers to instantly switch the focus mode from auto to manual with a slight twist of the focus ring. Coupled with a simple, functional design and the elimination of an aperture ring, this new mechanism considerably improves operability. The lens also incorporates an Extra-low Dispersion (ED) glass lens element and two aspherical lens elements for true-to-life image reproduction and overall size reduction. The image circle in DA-series lenses is designed to perfectly match the 23.5mm x 15.7mm size of the CCD used in PENTAX digital SLRs to optimize camera performance. The new design also contributes to a drastic reduction in size, weight and production cost, compared to 35mm-format counterparts with similar specifications.
PENTAX KAF Mount
11-element/10-group optical construction incorporating ED (Extra-low Dispersion) optical elements
Equivalent focal length to 75mm-300mm in the 35mm format with *ist DS
Compact dimensions with minimal aberrations
Responsive ?Quick-Shift Focus System? allows instant shift from AF to MF
52mm filter size
The image circle is designed to match the CCD used in PENTAX digital SLRs
Comes with a lens hood to minimize flare and ghost images
Dimensions (diameter x length): 2.6½ x 3.1½ (66.5mm x 78.5mm)