Leica Elmarit R 2.8/35mm repair

[stevemark]

Some years ago I got an ugly Leica R Elmarit 2.8/35mm at a local photo store - for free. Its focus was completely stuck, and the focusing ring itself had become loose. Obviously someone had been messing around with the lens since a front ring was missing. There was some fungus, too, but no scratches on the glass, and the aperture was working perfectly. Back then I tried hard to remove the front ring (name plate), but it simply didn't move at all. Opening the lens from the back side was possible, but I couldn't access the focusing ring from there. Finally I gave up.

Today I gave it another try. This time I put some acetone on the thread of the front ring, trying to dissolve either glue or dirt, but it didnt work either. The common lens ring rubber tools for removing rings were completely useless, and even using a lens spanner with spiky ends didn't work (but of course it did scratch the name ring). After some head-scratching I finally decided to do something one should NEVER do with a lens: I applied some penetrating oil, and after a few moments the front ring finally came off. To my complete surprise it was not only the front ring, but the complete optical block in front of the aperture!





Underneath a small screw became visible. Removing it should unlock the next part (including the built-in sunshade), but again it didn't work out as planned: I couldn't unscrew the part even though I was applying quite a lot of force. Penetreting oil didn't work either, and so I drilled a small hole into the ring and used the wrench spanner:





A small ring came off as well:



Now I finally had access to the set of four screws which had become lose, thus leaving the focusing inoperable:

[stevemark]

After removing the focusing ring, the remaining part of the lens looks like this:



Since the focusing thread was completely blocked, I had to use penetrating oil again (acetone didn't work) ... after just a few seconds it became loose! This stuff is amazing indeed.



Removing the lens bayonet ...



...and aperture ring (beware - the small 1mm diameter steel ball for aperture clicking mechanism is easily lost!):



The rear part of the lens, partly dismantled:



Dismantling it further:





Now all parts were cleaned thoroughly (either with detergent/water or acetone). The focusing thread was re-lubricated, the two lens surfaces on both sides of the aperture mechanism were cleaned (fungus), and the lens was re-assembled. It's now in fully working condition, the glass looks perfect, and the aperture is snappy - but of course the small inner front roing just around the front lens is still missing ...

Test / comparisons will follow.

S

[RokkorDoctor]

What brand/type penetrating oil did you use? Standard WD40, or something more sophisticated?

[Vintage_Photographer]

[stevemark]

[RokkorDoctor]