Name Manufacturer / Model	Mount Bayonet	Type Category	Year Released	Focal mm	Aperture f/	Weight g
Isco-GottingenWESTROCOLOR 50mm F/1.9 Type 2	EXAKTA	Portrait	1961	50mm	f/1.9	—
Isco-GottingenWestrogon 24mm F/4	EXAKTA+ M42, NIKON F, NIKON F DX, TOPCON	Wide	1958	24mm	f/4	600g
Isco-GottingenWESTROMAT 35mm F/2.8 Type 2	EXAKTA	Wide	1965	35mm	f/2.8	—
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
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
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