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Author Message   Mick0x Tinkerer Username: Mick0x Post Number: 1 Registered: 07-2010 Rating: N/A Votes: 0 Posted on Saturday, July 31, 2010 - 07:32 pm:    Hi, After servicing my Pentacon 50/1.8 I confidently bought a stuck CZJ Tessar 2.8 I found at a market. Serial number puts it at 1964 from what I can find (6561488). The thing is, there are no screws on the back! All the servicing info I can find online (including the excellent http://oomz.net/tessar/) says the screws should just be there, but there is a metal cover around the back of my lens. See pic below. Has anybody come across this? I just need to know how to get it off. Is it simply screwed on? I've tried twisting by hand to no avail. The next step would be a pipe wrench but not knowing if it is actually threaded I don't want to break the lens. Many thanks, Mick.