tester23 Posted August 10, 2019 Share #1 Posted August 10, 2019 Advertisement (gone after registration) Hi, I need to make some maintenance on 35mm V4 Summicron. I have a problem getting inside How do I remove the optic block from this version? Bayonet removal does not give any progress. I was repairing lenses before but I can't open this one. Internet does search shows little info on this version Quote Link to post Share on other sites More sharing options...
Advertisement Posted August 10, 2019 Posted August 10, 2019 Hi tester23, Take a look here Summicron 35mm V4 - how to open. I'm sure you'll find what you were looking for!
Frase Posted August 10, 2019 Share #2 Posted August 10, 2019 take the mount off then unscrew the focus just make sure you mark where the threads start to put it back together. Quote Link to post Share on other sites More sharing options...
lct Posted August 10, 2019 Share #3 Posted August 10, 2019 Welcome to the forum I just unscrewed the optical cell from the focusing mount of my early copy (pic) but beware that it has some plastic parts in it so do not force if it resists or i decline all responsibility . 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! 1 Quote 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3794962'>More sharing options...
jdlaing Posted August 10, 2019 Share #4 Posted August 10, 2019 I love lawyers. ”Here's how to do it but you are on your own”. 1 Quote Link to post Share on other sites More sharing options...
tester23 Posted August 10, 2019 Author Share #5 Posted August 10, 2019 (edited) soooo... you say that the only thing to do is to: hold by the filter edge, rotate CCW and it should let go? In my case I really used the force and it's still in there edit: judging by the numbers mine is produced in 90 or 91 and 'made in germany' Edited August 10, 2019 by tester23 Quote Link to post Share on other sites More sharing options...
lct Posted August 10, 2019 Share #6 Posted August 10, 2019 21 minutes ago, jdlaing said: I love lawyers. ”Here's how to do it but you are on your own”. I did it for free though Quote Link to post Share on other sites More sharing options...
lct Posted August 10, 2019 Share #7 Posted August 10, 2019 Advertisement (gone after registration) 3 minutes ago, tester23 said: soooo... you say that the only thing to do is to: hold by the filter edge, rotate CCW and it should let go? In my case I really used the force and it's still in there I would ask jdlaing then or ask a good workshop seriously. Quote Link to post Share on other sites More sharing options...
tester23 Posted August 10, 2019 Author Share #8 Posted August 10, 2019 (edited) sooo - here are the pictures - i marked the interesting part with red circle. So do you think I should focus on marked part or just continue to unscrew the front? Marked notch is symmetrical - there is second on the other side. However I can't fit any tool - gap is smaller than 1mm 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! Edited August 10, 2019 by tester23 Quote 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3794998'>More sharing options...
jdlaing Posted August 10, 2019 Share #9 Posted August 10, 2019 1 hour ago, lct said: I did it for free though That’s the part I even ind harder to believe! 😀 1 Quote Link to post Share on other sites More sharing options...
AndreasG Posted August 10, 2019 Share #10 Posted August 10, 2019 Have a look here Though it is different lens version, it explains well the typical steps of disassembly/assembly. Quote Link to post Share on other sites More sharing options...
tester23 Posted August 10, 2019 Author Share #11 Posted August 10, 2019 hi, yes, but this lens seems to be completely different design. I do not have this back ring that he unscrews first. See the image attached 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! Quote 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3795157'>More sharing options...
Frase Posted August 12, 2019 Share #12 Posted August 12, 2019 The black part that sits under the mount from memory should lift off then the lens should unscrew on the focus helix, i'm guessing you are trying to fix the aperture blades, I had to do that at one point as I carelessly dropped them out. Its a good test of patience but not really that difficult. Quote Link to post Share on other sites More sharing options...
tester23 Posted August 12, 2019 Author Share #13 Posted August 12, 2019 ok - i managed to solve this. I cleaned, relubed and reassembled everything. Works normally. I did not dare to fight with the actual glass. I do not have clean enough conditions or necessary tools. Do not try to replicate actions from my description - I will not be held responsible for any damage. So... steps for 35mm summicron ver4 pre-asph version disassembly are: 0. Focus on infinity 1. remove bayonet - do necessary markings 2. Remove the ring that is below bayonet (the one that was bolted together with bayonet using screws) - it is not attached. Little resistance expacted. Wiggle it a bit and it falls off without any force. 3. Just removed ring has 1 helicoil (the one that is visible and touches the rangefinder level in camera). Make pictures for later assembly. 4. Mark helicoil vs ring as it comes off. Notice and mark the release point. This part (point 4) took me half an hour - take your time. Make marks, photos etc. 5. Clean, lubricate, re-assemble helicoil with ring - put it away. 6. Slowly and again very carefully with all marks, photos etc unscrew the lens block from chassis helicoil. Mark the release point etc. 7. Optionally for me: on the main ring that is now empty you can unscrew 3 points to remove the focusing ring. In my case I had some glue securing the screws and I chosen not to touch it as I did not have any issue with this ring. 8. Back to optic block. Unscrew the yellow metal ring nearest to the rear lens. 9. Main helicoil is now almost loose. It is blocked by wire pin. In my case I pushed the pin gently into the lens body and it gave me enough space to remove the helicoil itself. This point only took me 20-30 minutes. Again take your time. 10. Make a few photos and remove the thin metal rings (washers?) 11. Remove o-ring slowly. 12. Very slowly remove aperture plastic ring - DO NOT LOOSE the metal ball and spring That's it. I still have some dust inside but I did not dare to touch the glass. I only unscrewed the front ring, removed the front lens only to discover that next lens is not easily removable. Because of risk of coatings damage or addtional dust I immediately re-assemebled this part. After reassembly everything works correctly. Now my lens body is refreshed, without oils, grease etc etc. One day I will send it to Leica to remove the dust. Pictures are showing the level I reached. Seems like the chassis of lens block is single piece of plastic. 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! Quote 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3796373'>More sharing options...
tester23 Posted August 12, 2019 Author Share #14 Posted August 12, 2019 And final point: forcing the "unscrew the front" would simply cause the total destruction of this lens. It seems that it is totally different to what is available as examples of different versions. Quote Link to post Share on other sites More sharing options...
lct Posted August 13, 2019 Share #15 Posted August 13, 2019 3 hours ago, tester23 said: And final point: forcing the "unscrew the front" would simply cause the total destruction of this lens. It seems that it is totally different to what is available as examples of different versions. Interesting thanks. Was you copy made in Canada or Germany? Just curious as the optical cell of my early Canadian version was not difficult to unscrew if memory serves me well. Quote Link to post Share on other sites More sharing options...
Frase Posted August 13, 2019 Share #16 Posted August 13, 2019 from the picture i thought you were trying to fix the aperture blades, lct my version is German and I'm pretty sure it came apart quite easily as I needed to get into the aperture blades, I would be very surprised if there was much difference in design. 1 Quote Link to post Share on other sites More sharing options...
lct Posted August 13, 2019 Share #17 Posted August 13, 2019 (edited) 31 minutes ago, Frase said: from the picture i thought you were trying to fix the aperture blades, lct my version is German and I'm pretty sure it came apart quite easily as I needed to get into the aperture blades, I would be very surprised if there was much difference in design. Did you find plastic parts like these? Just curious. 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! Edited August 13, 2019 by lct Quote 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3796622'>More sharing options...
tester23 Posted August 13, 2019 Author Share #18 Posted August 13, 2019 Hi, my version is German. By decoding the serial number i think it is from 1990 or 1991. You are probably asking about the aperture selector. No, it's not at all like that in my case. I do not have this white plastic thing anywhere. In my case the plastic is the aperture ring. In the ring you have holes facing front. This is is pressed against surface where the ball with spring is located (you see this place on my last image, its the hole on the left side of picture). All the parts that I disassembled are visible in the picture with the box. Everything is there. On the last picture that @lct attached you can see the bright metal ring with lens inside. I think it is the second lens counting from the front. This metal ring is visible when you remove the front lens. @lct What looks _really_ strange in your picture is the edge of the plastic from both plastic parts. It looks... broken(?). Like uneven edge. When you assemble it back, what is holding it together?? Quote Link to post Share on other sites More sharing options...
Frase Posted August 13, 2019 Share #19 Posted August 13, 2019 What he said. Quote Link to post Share on other sites More sharing options...
tester23 Posted August 13, 2019 Author Share #20 Posted August 13, 2019 (edited) I think the engineer have the option to reach the internal part of the block by removing the front lens, then using rubber block to unscrew the second lens with the plastic frame. However it does not give any reasonable access to the aperture. Second option is to think how to remove the rear lenses. There is one tiny screw (visible on the pic) that I did not touch. It looks like blocking/locating screw for the lens no to move - i did not want it to move so I did not touch it. Edited August 13, 2019 by tester23 Quote Link to post Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.