Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
Isco-GottingenWESTRON 28mm F/4 Type 1	EXAKTA	Wide	1961	28mm	f/4	—
Isco-GottingenWESTRON 28mm F/4 Type 2	EXAKTA	Wide	1964	28mm	f/4	—
Isco-GottingenWESTRON 35mm F/2.8 Type 1	EXAKTA	Wide	1959	35mm	f/2.8	—
Isco-GottingenWestron 35mm F/3.5	EXAKTA+ M39	Wide	1958	35mm	f/3.5	170g
Isco-GottingenWESTRON 35mm F/3.5 Type 1	EXAKTA	Wide	1958	35mm	f/3.5	170g
Isco-GottingenWESTRON 35mm F/3.5 Type 2	EXAKTA	Wide	1961	35mm	f/3.5	—
Isco-GottingenWESTRON 35mm F/3.5 Type 3	EXAKTA	Wide	1964	35mm	f/3.5	—
Itorex50mm F/40 Pan Focus	T MOUNT	Prime	—	50mm	f/40	60g
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
KamLan70mm F/1.1	CANON EF-M	Portrait	2023	70mm	f/1.1	776g
KamLan8mm F/3 Fisheye	CANON EF-M+ MICRO 4/3, SONY E	Fisheye	2019	8mm	f/3	272g
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