Ricoh has updated the 2006-vintage Pentax 10-17mm F3.5-4.5 fisheye lens with new coatings and a more modern exterior.
The lens, now known as the HD-Pentax DA fisheye 10-17mm F3.5-4.5 ED, is equivalent to 15-25.5mm when mounted on APS-C bodies for which it’s designed. It has the same optics and screw-drive AF system as the original model, with the main change being the addition of HD and SP (Super Protective) coatings. The appearance of the lens has been updated to fit newer Pentax bodies, and it now features a removable hood.
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https://www.dpreview.com/news/7597829912/ricoh-updates-pentax-10-17mm-f3-5-4-5-fisheye-with-new-coatings-and-exterior
