The original lens is an XR Rikenon Reflex 600mm F8, made in Japan for Ricoh’s XR/K-mount SLR system. Period/reference lens lists also identify the Rikenon 600mm F8 Reflex as an XR-version K-mount lens.
RICOH XR RIKENON 50mm MF Lens [Near MINT] f/2 for Pentax K From Japan 612
RICOH XR RIKENON 50mm F2 Standard Prime Lens K Mount Manual Focus Japan
Ricoh XR Rikenon 50mm f/2 S Lens - Pentax K Mount, Excellent Condition
CLA'd [MINT] RICOH XR RIKENON 55mm f/1.2 Lens For Pentax K Mount From JAPAN
[Almost MINT] RICOH XR RIKENON 50mm MF lens f/2 for Pentax K From JAPAN
Ricoh XR Rikenon 50mm F2 L Cine Mod Prime Portrait Lens | Canon EF!
![RICOH XR RIKENON 50mm MF Lens [Near MINT] f/2 for Pentax K From Japan 612](https://images.buynet.work/thumb.php?i=395354131&s=240)
![CLA'd [MINT] RICOH XR RIKENON 55mm f/1.2 Lens For Pentax K Mount From JAPAN](https://images.buynet.work/thumb.php?i=399059297&s=240)
![[Almost MINT] RICOH XR RIKENON 50mm MF lens f/2 for Pentax K From JAPAN](https://images.buynet.work/thumb.php?i=401255138&s=240)
