Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
KenkoMIL TOL 400mm F/8 Mirror MC	T MOUNT	Mirror	2012	400mm	f/8	340g
Kerlee35mm F/1.2 SLR	CANON EF	Wide	2016	35mm	f/1.2	690g
KernMacro-Switar 50mm F/1.9	M42	Macro	—	50mm	f/1.9	—
KinoshitaKISTAR 55mm F/1.2	CONTAX/YASHICA	Portrait	2015	55mm	f/1.2	310g
KiyoharaKogaku 50mm F/4.5 Soft	T MOUNT	Prime	1987	50mm	f/4.5	125g
KiyoharaKogaku 50mm F/4.5 Soft [VK50R]	T MOUNT	Prime	1987	50mm	f/4.5	125g
KiyoharaKogaku 70mm F/5 Soft	T MOUNT	Prime	1986	70mm	f/5	136g
KiyoharaKogaku 70mm F/5 Soft [VK70R]	T MOUNT	Prime	1986	70mm	f/5	136g
KomuraSankyo Kohki Komura 200mm F/4.5	M42	Telephoto	—	200mm	f/4.5	—
KOMURANON75-150mm F/3.8 KMC "Reporter"	M42	Zoom	1980	75-150mm	f/3.8	625g
KOMURANON80-210mm F/4.5 KMC	M42	Zoom	1975	80-210mm	f/4.5	—
Kowa110mm F/5.6	KOWA SIX	Telephoto	—	110mm	f/5.6	680g
Kowa110mm F/5.6 Macro	KOWA SIX	Macro	1970	110mm	f/5.6	680g
Kowa150mm F/3.5	KOWA SIX	Telephoto	1968	150mm	f/3.5	920g
Kowa150mm F/3.5 [I]	KOWA SIX	Telephoto	1968	150mm	f/3.5	920g
Kowa150mm F/3.5 [II]	KOWA SIX	Telephoto	—	150mm	f/3.5	675g
Kowa19mm F/4.5 Fisheye	KOWA SIX	Fisheye	1970	19mm	f/4.5	2290g
Kowa200mm F/4.5	KOWA SIX	Telephoto	—	200mm	f/4.5	830g
Kowa250mm F/5.6	KOWA SIX	Telephoto	—	250mm	f/5.6	780g
Kowa35mm F/4.5	KOWA SIX	Wide	1970	35mm	f/4.5	720g
Kowa40mm F/4	KOWA SIX	Prime	1970	40mm	f/4	900g
Kowa500mm F/8	KOWA SIX	Telephoto	1970	500mm	f/8	2060g
Kowa55mm F/3.5	KOWA SIX	Prime	1968	55mm	f/3.5	850g
Kowa55mm F/3.5 [I]	KOWA SIX	Prime	1968	55mm	f/3.5	850g
Kowa55mm F/3.5 II	KOWA SIX	Prime	—	55mm	f/3.5	725g
Kowa85mm F/2.8	KOWA SIX	Telephoto	1968	85mm	f/2.8	530g
KuribayashiC.C. Petri Orikkor 135mm F/3.5	M42	Telephoto	1959	135mm	f/3.5	293g
KuribayashiC.C. Petri Orikkor 180mm F/3.5	M42	Telephoto	1959	180mm	f/3.5	610g