Revised title: Pentax 10-17mm f/3.5-4.5 Fish-Eye Lens for Pentax Digital SLR Cameras

Revising the content while maintaining the original meaning and enhancing the reading experience:

With its extra-low dispersion glass and original lens coatings, this lens excels in delivering superior contrast, clarity, and edge-to-edge sharpness. The Pentax DA 10-17mm fisheye lens allows you to capture a breathtaking 180-degree angle of view, creating images with an expanded perspective that includes a creatively deformed outlook and a sharp pan focus throughout the entire frame. Designed for the Pentax *ist series of digital SLR cameras, the lens's image circle is optimized to perfectly match the 23.5 x 15.7mm size of the CCD used in these cameras, ensuring optimal camera performance. Moreover, the new design of this lens contributes to a significant reduction in size, weight, and production cost compared to 35mm counterparts with similar specifications.

Additional features include a 35mm equivalent focal length of 15-26mm, new water- and oil-repellent 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 that allows instant switching from autofocus (AF) to manual focus (MF). The lens construction comprises 10 elements in 8 groups, with an angle of view ranging from 180 to 100 degrees and a fully automatic diaphragm with 6 blades. The minimum aperture is f/22-32, and the minimum focusing distance is 0.46 feet, with a maximum magnification of 0.23x to 0.39x. The lens measures 2.8 inches in diameter and weighs 11.3 ounces, featuring a metal Pentax(r) Kaf lens mount.

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