Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
RicohXR Rikenon 28mm F/3.5 ASPH	PENTAX K	Wide	1996	28mm	f/3.5	55g
RicohXR Rikenon 28mm F/3.5 Aspheric	PENTAX K	Wide	1996	28mm	f/3.5	55g
RicohXR Rikenon 300mm F/4.5 APO	PENTAX K	Telephoto	1982	300mm	f/4.5	1050g
RicohXR Rikenon 35-70mm F/3.5 Macro	PENTAX K	Macro	1981	35-70mm	f/3.5	345g
RicohXR RIKENON 35mm F/2.8	PENTAX K	Wide	1977	35mm	f/2.8	190g
RicohXR Rikenon 35mm F/2.8 [I]	PENTAX K	Wide	1977	35mm	f/2.8	190g
RicohXR Rikenon 35mm F/2.8 [II]	PENTAX K	Wide	1980	35mm	f/2.8	240g
RicohXR Rikenon 45mm F/2.8	PENTAX K	Prime	1994	45mm	f/2.8	52g
RicohXR Rikenon 50mm F/1.4	PENTAX K	Portrait	1977	50mm	f/1.4	260g
RicohXR Rikenon 50mm F/1.7	PENTAX K	Portrait	1977	50mm	f/1.7	210g
RicohXR Rikenon 50mm F/1.7 [I]	PENTAX K	Portrait	1977	50mm	f/1.7	210g
RicohXR Rikenon 50mm F/1.7 [II]	PENTAX K	Portrait	1981	50mm	f/1.7	153g
RicohXR Rikenon 50mm F/2	PENTAX K	Portrait	1977	50mm	f/2	190g
RicohXR Rikenon 50mm F/2 L	PENTAX K	Portrait	1980	50mm	f/2	170g
RicohXR Rikenon 50mm F/2 S	PENTAX K	Portrait	1981	50mm	f/2	140g
RicohXR Rikenon 55mm F/1.2	PENTAX K	Portrait	1996	55mm	f/1.2	312g
RicohXR Rikenon 55mm F/1.7	PENTAX K	Portrait	—	55mm	f/1.7	150g
RicohXR Rikenon 55mm F/2.2	PENTAX K	Prime	1980	55mm	f/2.2	140g
RicohXR Rikenon 70-150mm F/3.5 Macro	PENTAX K	Macro	1977	70-150mm	f/3.5	735g
RicohXR Rikenon 70-150mm F/4 Macro	PENTAX K	Macro	1981	70-150mm	f/4	465g
RicohXR Rikenon Reflex 600mm F/8	PENTAX K	Mirror	1982	600mm	f/8	751g
Risespray50mm F/1.7 SLR	CANON EF	Portrait	—	50mm	f/1.7	180g
Risespray8mm F/3 Fisheye CS SLR	CANON EF	Fisheye	—	8mm	f/3	428g
Rockstar10mm F/8 ED Fisheye M	LEICA M+ CANON RF	Fisheye	2023	10mm	f/8	36g
Rockstar24mm F/6.3 ASPH M	LEICA M	Wide	2022	24mm	f/6.3	82g
Rockstar40mm F/5.6 M	LEICA M	Prime	2022	40mm	f/5.6	144g
RodenstockEURYGON 30mm F/2.8	EXAKTA+ M42	Wide	1956	30mm	f/2.8	240g
RodenstockROTELAR 100mm F/4	M42	Telephoto	1956	100mm	f/4	—