Radio01 Posted December 8, 2021 Share #1 Â Posted December 8, 2021 Advertisement (gone after registration) Hi All. New to the forum but looking for some community support. Im in need of separating the lens group from the focus mechanism on my 90mm Summicron. Ive had good success with a 50mm in the past however there are a few video tutorials knocking around that got me started. Does anyone have any experience with the 90mm (the version with the retractable hood) I cant work out how to do it. I unscrewed what looked like it could be a locking retainer at the back of the lens. However this didnt work it just released one of the rear elements. Any help would be amazing. Thanks! Link to post Share on other sites More sharing options...
Advertisement Posted December 8, 2021 Posted December 8, 2021 Hi Radio01, Take a look here Leica Summicron 90mm disassembly. I'm sure you'll find what you were looking for!
adan Posted December 9, 2021 Share #2  Posted December 9, 2021 7 hours ago, Radio01 said: Does anyone have any experience with the 90mm (the version with the retractable hood) Umm - every 90mm Summicron since 1960 or so has had a retractable hood. In four very different models. Which one did you have in mind? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members!  Link to post Share on other sites Simply register for free here – We are always happy to welcome new members!  ' data-webShareUrl='https://www.l-camera-forum.com/topic/327317-leica-summicron-90mm-disassembly/?do=findComment&comment=4328793'>More sharing options...
Radio01 Posted December 9, 2021 Author Share #3  Posted December 9, 2021 Hi Adan. Thanks so much for the reply. It appears to be the 3rd one down. It has a serial of 3211585 which from looking seems like its some where around 1982 date of manufacture? It is a non asph version. Link to post Share on other sites More sharing options...
adan Posted December 9, 2021 Share #4 Â Posted December 9, 2021 Here's a link (with pix) for that version, "disassembled" accidentally. See post #12 for image. Looks like it just takes brute force to fracture the "Lock-tite" or "Super-glue" thread cement on a single internal master connecting thread. Because of the free-spinning lens hood, you need to extend that and then grasp the lens barrel/aperture ring underneath (or, as in this case, a jammed filter) and just "gorilla" it off. But I don't know if that is actually the approved or recommended method, and I suspect Leica doesn't expect anyone but a qualified tech to do it. It is not supposed to come apart outside of the factory or a repair center. Â Link to post Share on other sites More sharing options...
Radio01 Posted December 9, 2021 Author Share #5  Posted December 9, 2021 Hi Adan  Again, thank you for the reply and sharing your knowledge.Its very much appreciated. I did figure that this might be the solution and did try this initially. The Problem I had was that under the retractable hood is another sleeve type part that has the dot on as the witness mark for the Iris. as I tried to unscrew, I shifted this sleeve, which wasnt the nicest feeling or sound in the world That is what led me here to ask if that was what I needed to do and not totally butcher it. Now that I have this info I will try again or try slipping the sleeve up out the way and grabbing onto what is underneath. One last question for you, how simple is it to remove the retractable hood? That is my next task, im sure I will be able to work it out, but if you have come across this before, it might save some worry!  Thanks again Link to post Share on other sites More sharing options...
a.noctilux Posted December 9, 2021 Share #6  Posted December 9, 2021 5 hours ago, Radio01 said: Hi Adan. Thanks so much for the reply. It appears to be the 3rd one down. It has a serial of 3211585 which from looking seems like its some where around 1982 date of manufacture? It is a non asph version. This one is not to be unscrewed like the former 90mm Summicron. I had a couple of those and never tried to unscrew anything. Link to post Share on other sites More sharing options...
Radio01 Posted December 9, 2021 Author Share #7  Posted December 9, 2021 (edited) Advertisement (gone after registration) Hi A.Noctolux  Interesting. How would they be separated then? There is no obvious way. Unless I have to unscrew the front element. (Surely not)  My lens does look exactly the same as the image in post 12 in the thread that Adan posted a link to which looks like it just unscrews. Edited December 9, 2021 by Radio01 Link to post Share on other sites More sharing options...
a.noctilux Posted December 9, 2021 Share #8  Posted December 9, 2021 Like this ? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members!  I think it's an accident. This lens E55 filter type is not officially with detachable head. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members!  I think it's an accident. This lens E55 filter type is not officially with detachable head. ' data-webShareUrl='https://www.l-camera-forum.com/topic/327317-leica-summicron-90mm-disassembly/?do=findComment&comment=4329098'>More sharing options...
Radio01 Posted December 9, 2021 Author Share #9  Posted December 9, 2021 Exactly! I know its not supposed to happen in general every day use (i.e to swap optical block etc) but that is what I want to do. To separate it. Link to post Share on other sites More sharing options...
a.noctilux Posted December 9, 2021 Share #10  Posted December 9, 2021 2 minutes ago, Radio01 said: Exactly! I know its not supposed to happen in general every day use (i.e to swap optical block etc) but that is what I want to do. To separate it. I wish you success doing it, and most important to get back without flaw. Link to post Share on other sites More sharing options...
Radio01 Posted December 9, 2021 Author Share #11  Posted December 9, 2021 Thankyou A.Noctolux. I will update you with the results Link to post Share on other sites More sharing options...
Radio01 Posted December 11, 2021 Author Share #12  Posted December 11, 2021 Hi guys. Again. Thanks so much for your help and input, I have tried everything now. There is no budging this lens. I fear someone may have locktited it in there. Link to post Share on other sites More sharing options...
sekwenza Posted January 30, 2022 Share #13 Â Posted January 30, 2022 On 12/9/2021 at 4:42 PM, Radio01 said: One last question for you, how simple is it to remove the retractable hood? That is my next task, im sure I will be able to work it out, but if you have come across this before, it might save some worry! Did you manage to remove the hood? I had to take off the retaining ring for the hood to use a filter so I released the hood and now I can't make them collapse on each other properly and the barrel comes in till about 4m only not to infinity. I can't find anything about it. thanks Link to post Share on other sites More sharing options...
a.noctilux Posted January 30, 2022 Share #14 Â Posted January 30, 2022 @sekwenza My post #10, the lens is NOT designed to be worked on easily, so I wrote "...most important is to get back without flaw". Here you proved it ! Â Take your lens to a good repair person to cure the flaw. Link to post Share on other sites More sharing options...
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