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Designed for proprietary PENTAX Kaf Mount Extra-low Dispersion (ED) glass lens for superior sharpness and color correction Responsive Quick-Shift Focus System allows instant shift from AF to MF Image circle is designed to match the CCD used in PENTAX digital SLRs Convert focal length to 24.5mm-69mm with *ist D (optional)   Filter Size 67mm f/Stop Range 4-22 Minimum Focus Distance m) Magnification 1:3.8 Zoom/Focus Control Two-touch Angle of View ° with the *istD camera Groups/Elements Length mm) Maximum Diameter mm) Weight 13 oz (365g) Not recommended for 35mm film or "full-frame" digital SLR cameras  

mm fisheye lens with f/ maximum aperture for Pentax digital SLR cameras Creates images with expanded perspective, with creatively deformed outlook and sharp pan focus Image circle is designed to perfectly match 23.5 x 15.7mm CCD used in Pentax digital SLRs Water- and oil-repellant SP lens coatings; extra-low-dispersion glass for superior sharpness Minimum focusing distance of 0.46 feet; measures 2.8 inches in diameter; weighs 11.3 ounces Capture fisheye imagery with a 180-degree angle of view with the Pentax DA mm fisheye lens. Designed for the Pentax *ist series of digital SLR cameras, the lens creates images with an expanded perspective, including images with a creatively deformed outlook and a sharp pan focus that extends throughout the entire frame. The image circle in DA series lenses, meanwhile, is designed to perfectly match the 23.5 x 15.7mm size of the CCD used in Pentax digital SLRs to optimize camera performance. Plus, the new design contributes to a drastic reduction in size, weight, and production cost compared to 35mm counterparts with similar specifications. Additional features include a 35mm equivalent focal length of mm; new water- and oil-repellant super-protective (SP) lens coatings for easy cleaning; extra-low-dispersion (ED) glass for superior sharpness and color correction; and a responsive Quick Shift Focus System for switching instantly from autofocus (AF) to manual focus (MF).   Lens construction: 10 elements in 8 groups Angle of view: 180 to 100 degrees Diaphragm: Fully automatic Blades: 6 Minimum aperture: f/ Metering: TTL open-aperture meeting Minimum focusing distance: 0.46 feet Maximum magnification: 0.23x to 0.39x Dimensions: 2.8 inches in diameter Weight: 11.3 ounces