Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
RicohRikenon P 70-300mm F/4.5-5.8	PENTAX K	Zoom	1988	70-300mm	f/4.5	—
RicohRikenon P 70-300mm F/4.5-5.8 Macro	PENTAX K	Macro	—	70-300mm	f/4.5	—
RicohXR Rikenon 135mm F/2.8	PENTAX K	Telephoto	1977	135mm	f/2.8	440g
RicohXR Rikenon 16mm F/2.8 Fisheye	PENTAX K	Fisheye	1982	16mm	f/2.8	300g
RicohXR Rikenon 18mm F/2.8	PENTAX K	Wide	1982	18mm	f/2.8	348g
RicohXR Rikenon 200mm F/4	PENTAX K	Telephoto	1978	200mm	f/4	405g
RicohXR Rikenon 200mm F/4 [I]	PENTAX K	Telephoto	1977	200mm	f/4	405g
RicohXR Rikenon 200mm F/4 [II]	PENTAX K	Telephoto	1980	200mm	f/4	620g
RicohXR Rikenon 24mm F/2.8	PENTAX K	Wide	1982	24mm	f/2.8	210g
RicohXR Rikenon 28mm F/2.8	PENTAX K	Wide	1977	28mm	f/2.8	190g
RicohXR Rikenon 28mm F/3.5	PENTAX K	Wide	1977	28mm	f/3.5	190g
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