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.