Ricoh Imaging might not have a shiny new mirrorless camera range to focus on like many of its rivals, but that’s allowed it to finesse its existing, much-loved lines, from its Pentax-branded DSLRs through to its GR-series compact cameras.

And now it’s sought to better an older fisheye lens developed for Pentax DSLRs, namely the smc Pentax-DA Fisheye 10-17mm F3.5-4.5ED (IF), which has been transformed into the new HD-Pentax DA Fisheye 10-17mm F3.5-4.5 ED.
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https://www.techradar.com/news/ricoh-imaging-launches-hd-pentax-da-fisheye-10-17mm-f35-45-ed-lens