The Pentax SMCP-DA 12-24mm f/4 ED AL lens was developed for exclusive use with Pentax digital SLR cameras, and is a compact, lightweight two-times zoom lens that offers an ultra-wide-angle perspective equivalent to 18.5mm to 37mm in the 35mm format.
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 SLR cameras to optimize camera performance. This design also contributes to a drastic reduction in size, weight and production cost, compared to 35mm-format counterparts with similar specifications.
Note: Not suitable for 35mm film SLR cameras.
Construction 11 Groups/ 13 Elements Angle of view 99° - 61° F stop range f/4-22 Closest Focusing Distance 1.0 ft. (0.3m) Maximum Magnification 0.12X Filter Size 77mm Dimensions (Length x Diameter) 3.4" x 3.3" (87.5mm x 83.5mm) Weight (Without Hood) 15.2 oz. (430g) Notes Diaphragm: Fully Automatic
Photometric Method: TTL open-aperture metering
8 Aperature Blades