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.
Extra-low Dispersion (ED) glass for superior sharpness and color correction
Two aspherical elements
Responsive "Quick-Shift Focus System" allows instant shift from AF to MF
Internal Focus system makes focusing smoother and faster
Durable metallic lens mount