Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
JintuAF 27mm F/2.8	FUJIFILM X	Wide	2024	27mm	f/2.8	181g
Jupiter-21A 200mm F/4	T MOUNT	Telephoto	1968	200mm	f/4	740g
Jupiter-21M 200mm F/4	M42	Telephoto	1971	200mm	f/4	980g
Jupiter-37A 135mm F/3.5	T MOUNT	Telephoto	—	135mm	f/3.5	410g
Jupiter-37A 135mm F/3.5 [MC]	T MOUNT	Telephoto	—	135mm	f/3.5	410g
Jupiter-6-2 180mm F/2.8	M42	Telephoto	—	180mm	f/2.8	1470g
Jupiter-9 85mm F/2	M42+ CONTAX	Portrait	1951	85mm	f/2	360g
Jupiter-9 85mm F/2 [MC]	M42	Portrait	—	85mm	f/2	360g
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/3.5 C	M42	Macro	1955	40mm	f/3.5	145g
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+ FUJIFILM X, MICRO 4/3, SONY E	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+ FUJIFILM X, MICRO 4/3, SONY E	Portrait	2017	50mm	f/1.1	248g
KamLan50mm F/1.1 II	CANON EF-M+ FUJIFILM X, MICRO 4/3, SONY E	Portrait	2019	50mm	f/1.1	578g
KamLan55mm F/1.2	SONY E+ SONY FE	Portrait	2017	55mm	f/1.2	685g
KamLan70mm F/1.1	CANON EF-M	Portrait	2023	70mm	f/1.1	776g
Kase200mm F/5.6 Reflex	CANON RF+ HASSELBLAD XCD	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
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