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50mm Summilux loose lens


IWC Doppel

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Any ideas about the assembly of the 50mmVII Summilux, I noticed that I can unscrew the lens, I have nipped it up and it works fine but I did manage to unscrew a little adjusting the aperture ring. It has only recently been serviced and coded I did notice this once before.

 

Is this normal in terms of the lens being tightened on the threads fro assembly ? Focus is buttery smooth and all seems fine ?

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It happened to me years ago with a 35 cron. I sent it to Leica just to make sure. It cam back and did not "unscrew" again. I believe there is either a set screw or they use something on the threads to keep it from doing this. Can't remember.

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What is a "50mmVII Summilux"? The current 50mm Summilux is the third version, while the Summicron is version 4. Am I misinformed?

 

The old man from the Age of the v.1 5cm Summicron

 

you seem to write "v.2" and he writes it VII, obviously there aren't seven of them.

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It happened to me years ago with a 35 cron. I sent it to Leica just to make sure. It cam back and did not "unscrew" again. I believe there is either a set screw or they use something on the threads to keep it from doing this. Can't remember.

 

Actually it's both, depending. Up through the early 70s it was setscrews, from late 70s on, thread-locking compound. Both have their merits and demerits.

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Actually it's both, depending. Up through the early 70s it was setscrews, from late 70s on, thread-locking compound. Both have their merits and demerits.

Mine was a thread lock compound issue I guess. It was probably the last 80's. The lens worked perfectly except when taking it off. Leica NJ fixed it under warranty very quickly.

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