 smc Pentax DA 12-24mm - Features
As with all DA-Series lenses, this lens 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. With Extra-low Dispersion (ED) glass lens element and two aspherical lens elements, the lens offers more true-to-life image reproduction.
smc Pentax DA 12-24mm - Optimized for digital
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. Additional aspherical optical elements and compact dimensions (diameter x length) of 3.3½ x 3.4½ (83.5mm x 87.5mm) are the key facts for the Pentax Digital DA lenses.
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smc Pentax DA 12-24mm lens introduction : Pentax Imaging Company has announced yet another compact, lightweight, interchangeable zoom lens for exclusive use with Pentax digital SLR cameras including the Pentax *ist D and the Pentax *ist DS digital SLRs. The smc Pentax DA 12mm-24mm F4 ED AL [IF] is the sixth DA-series lens offered by the photo manufacturer. The Pentax DA 12mm-24mm F4 ED AL [IF] will feature: 2X zoom coverage in the ultra-wide angle range with an angle of view from 99 degrees to 61 degrees (equivalent in focal length from 18.5mm to 37mm in the 35mm format) when mounted on the Pentax *ist D or *ist DS digital SLR camera body and 13-element/11-group optical construction incorporating ED (Extra-low Dispersion). 
