Ricoh announces the updated version of its HD Pentax-DA Fisheye 10-17mm f/3.5-4.5 ED Lens with new coatings and a more modern exterior.
The lens is equivalent to 15-25.5mm when mounted on APS-C bodies. 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.dailycameranews.com/2019/07/hd-pentax-da-fisheye-10-17mm-f-3-5-4-5-ed-lens-announced/
