What is this huge f/1.0 lens?

ptysiu_11 · Joined: 22 Jul 2024 Posts: 2

Hello!
I gotten in my hands some interesting lens, but I can't find any specific information about it; maybe you can help me out?

I belive it's called oгc-70 or oгo-70 (the paint maybe was brushed off)
It's really heavy and really big; 130mm high (without lens hood)
Has a screw mount of about 93mm.
Probably has military use and apparently it lets infrared light through.
I dont know If the front and back element of lens glass should look like that... you cant's see through the lens (maybe it was design only to see infrared? I don't know)
For some reason it has aperture in front of front glass.
When I rotate the focus ring nothing moves - maybe glass inside the lens moves, but I can't see it.

Here is a photo that I took holding a camera and lens in my hands - bright daylight, 30s exposure, ISO 12 800
Maybe it will help...

Can you help me in any way to find any information about it?

Thanks!

kathala · Joined: 13 May 2022 Posts: 141

that's an old russian lens, the letters transliterate to OGS.
the aperture looks retrofitted to me (?)
likely a scientific lens for the nonvisible spectrum (those are quite common, and the speed would be in keeping with that). you might try it with a full spectrum camera. the coating would have been intact, i.e. a mirror-like surface throughout. now it looks in tatters and covered with fungus.

ptysiu_11 · Joined: 22 Jul 2024 Posts: 2

Thank you. That is more info to grasp onto.