Carl Zeiss Jena Biotar 1,5 75 mm very stiff focus and aperture ring - Repair Disassembly re-grease

[@mikelborrega5821]

Hi! Thank you for the video. Where can I buy this spanner wrench? With mine is not possible to dismount the lens…

[@SCampbell86]

I've degreased and regreased my helicoid, but when I put the screws back in that align with the lengthways groove in the inner threads of the helicoid, the outer part of the helicoid no longer slides over the inner part

[@gheorghiualex]

Thank you for the video!! Do you have any idea where to find the technical details of the ring that keeps in place the rear lens?

[@kamtec4185]

I´m sorry, i have no idea.

[@gheorghiualex]

@@kamtec4185 Thanks a lot for answering. I'll probably go and measure it somehow. I found some old plans of the biotar 75 but it doesn't say there

[@rolltrollroll]

But how to take out and clean the lenses?

[@gheorghiualex]

if still interested, I can help you, send me your mail address or your facebook