Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
Kaleinar-5N 100mm F/2.8 MC	NIKON F	Telephoto	1983	100mm	f/2.8	380g
Kalimar300mm F/5.6 Mirror	T MOUNT	Mirror	—	300mm	f/5.6	207g
Kamerabau-Anstalt-VaduzKilfitt-Makro-Kilar D 40mm F/2.8	INTERCHANGEABLE MOUNT	Macro	1956	40mm	f/2.8	170g
Kamerabau-Anstalt-VaduzKilfitt-Makro-Kilar D 40mm F/3.5 C	M42	Macro	1955	40mm	f/3.5	145g
Kamerabau-Anstalt-VaduzKilfitt-Makro-Kilar E 40mm F/2.8	INTERCHANGEABLE MOUNT	Macro	1956	40mm	f/2.8	170g
Kamerabau-Anstalt-VaduzKilfitt-Makro-Kilar E 40mm F/3.5 C	M42	Macro	1955	40mm	f/3.5	145g
KamLan28mm F/1.4	CANON EF-M	Wide	2018	28mm	f/1.4	384g
KamLan32mm F/1.1	CANON EF-M	Wide	2021	32mm	f/1.1	572g
KamLan50mm F/1.1	CANON EF-M	Portrait	2017	50mm	f/1.1	248g
KamLan50mm F/1.1 II	CANON EF-M	Portrait	2019	50mm	f/1.1	578g
KamLan55mm F/1.2	SONY E	Portrait	2017	55mm	f/1.2	685g
KamLan55mm F/1.4	CANON RF	Portrait	2022	55mm	f/1.4	475g
KamLan70mm F/1.1	CANON EF-M	Portrait	2023	70mm	f/1.1	776g
KamLan8mm F/3 Fisheye	CANON EF-M	Fisheye	2019	8mm	f/3	272g
KamLan8mm F/3.0 Fisheye	CANON EF-M	Fisheye	2018	8mm	f/3	245g
Kase200mm F/5.6 Reflex	CANON RF	Mirror	2024	200mm	f/5.6	430g
Kase200mm F/5.6 Reflex GFX	FUJIFILM G	Mirror	2024	200mm	f/5.6	451g
Kase200mm F/5.6 Reflex SLR	CANON EF	Mirror	2024	200mm	f/5.6	384g
Kase200mm F/5.6 Reflex XCD	HASSELBLAD XCD	Mirror	—	200mm	f/5.6	—
KaseAF 85mm F/1.4	FUJIFILM X	Portrait	2025	85mm	f/1.4	580g
Kaxinda50mm F/0.95 HD MC	CANON RF	Portrait	—	50mm	f/0.95	590g
Kelda500mm F/6.3 Mirror DX	T MOUNT	Mirror	—	500mm	f/6.3	597g
Kelda6.5mm F/3.5 ASPH Fisheye CS	CANON EF	Fisheye	—	6mm	f/3.5	516g
Kelda8mm F/3.5 Fisheye CS	CANON EF	Fisheye	—	8mm	f/3.5	516g
Kenko35mm F/4 Soft MC	T MOUNT	Wide	1996	35mm	f/4	—
Kenko400mm F/8 Mirror MC	T MOUNT	Mirror	2012	400mm	f/8	340g
Kenko400mm F/8 Mirror MC N II	T MOUNT	Mirror	2017	400mm	f/8	500g
Kenko400mm F/8 Mirror MC N II S	T MOUNT	Mirror	2021	400mm	f/8	500g