Frase Posted August 13, 2019 Share #21 Posted August 13, 2019 Advertisement (gone after registration) It is quite fragile inside though, the part I don't know what its called but it kind of controls how tight the focus works where the two lens parts move against each other is very crude/cheap. Link to post Share on other sites More sharing options...
Advertisement Posted August 13, 2019 Posted August 13, 2019 Hi Frase, Take a look here Summicron 35mm V4 - how to open. I'm sure you'll find what you were looking for!
tester23 Posted August 13, 2019 Author Share #22 Posted August 13, 2019 And for the other people, the case of rotating / loose front element. If that would be my version then it's the case with locking pin getting accidentally removed. It's the pressure fit (small pressure). I could imagine the situation when it gets loose due to anything (mistake in installation, temperature etc) and falls out of the hole. Then the helicoid is not bonded with the optical block any more and rotates. I marked the slot for pin on the picture. Then tightening the locking ring that is pushing on it is like a workaround. You would still have a 2,5-3mm long metal piece loose somewhere inside That all is applicable only to this version - i do not know other versions 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/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3796658'>More sharing options...
tester23 Posted August 13, 2019 Author Share #23 Posted August 13, 2019 (edited) @Frase - so how did you get access to your aperture? Did you remove the lenses (glass) or are you suggesting that I should try to find the way to open this plastic component with all the glass inside? By the way I know how the dust got inside. This arm that is controlling the aperture rotating ring - it is in the space cut out of plastic enclosure. It's about 1cm long and that's the hole through which the dust gets in. I was thinking that they could use some elastic seal on it - however after 30 years this seal decomposing would make it much worse than no seal at all. Edited August 13, 2019 by tester23 Link to post Share on other sites More sharing options...
Frase Posted August 13, 2019 Share #24 Posted August 13, 2019 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 know longer have flickr but did find this pic on my phone the rear element just unscrews and you have access to the aperture blades Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! I know longer have flickr but did find this pic on my phone the rear element just unscrews and you have access to the aperture blades ' data-webShareUrl='https://www.l-camera-forum.com/topic/300179-summicron-35mm-v4-how-to-open/?do=findComment&comment=3796670'>More sharing options...
Frase Posted August 13, 2019 Share #25 Posted August 13, 2019 13 minutes ago, tester23 said: @Frase - so how did you get access to your aperture? Did you remove the lenses (glass) or are you suggesting that I should try to find the way to open this plastic component with all the glass inside? By the way I know how the dust got inside. This arm that is controlling the aperture rotating ring - it is in the space cut out of plastic enclosure. It's about 1cm long and that's the hole through which the dust gets in. I was thinking that they could use some elastic seal on it - however after 30 years this seal decomposing would make it much worse than no seal at all. If its just dust I wouldn't open it up I can't remember why I opened mine maybe it was a fluff or a hair but from memory I'm pretty sure just after this pic the aperture blades fell out! Link to post Share on other sites More sharing options...
tester23 Posted August 13, 2019 Author Share #26 Posted August 13, 2019 very interesting - thanks - do you have picture with other angle of this element? Or could you send this one to me without down-scaling? otherproject@protonmail.com I would like to understand how this rear lens is installed. It's the rear element - must stay in perfect condition... How did you unscrew it? Using rubber ring ? Do you also have the picture "before"? On my picture with rear element there is not really something I could easily identify as "to be unscrewed" - but there is no miracles - factory must have done it somehow Link to post Share on other sites More sharing options...
tester23 Posted August 13, 2019 Author Share #27 Posted August 13, 2019 Advertisement (gone after registration) Hmm... on the picture, did you rotate the rear lens “upside down” and the threads sticking out are actually the ones going in the lens body? Link to post Share on other sites More sharing options...
lct Posted August 13, 2019 Share #28 Posted August 13, 2019 1 hour ago, tester23 said: @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?? Not the same lens as mine (1st pic). This one is in fact broken. It is a Canadian copy too so i wonder if German ones have those plastic parts as well. Link to post Share on other sites More sharing options...
Frase Posted August 13, 2019 Share #29 Posted August 13, 2019 40 minutes ago, tester23 said: Hmm... on the picture, did you rotate the rear lens “upside down” and the threads sticking out are actually the ones going in the lens body? no i'm pretty sure thats the right way round as thats why i took the pic to remind me which way the element sits, I'm not sure how I removed it and I don't seem to have anymore pics I did find this which may help and this https://sites.google.com/site/kameraque/home/bokeh-king-is-naked-repairing-leica-summicron-35mm-pre-asph 1 Link to post Share on other sites More sharing options...
NigelG Posted August 13, 2019 Share #30 Posted August 13, 2019 It may not be of any help/use but I can tell you what happens if you (or someone else!) inadvetantly unscrew the lens from the front... I have a v4 German copy which is currently with Leica being reassembled and having new aperture blades (if I interpret the workshop quote correctly). The front ring (with the serial number on) had come loose on mine - I think it is a friction fit only - and an inquisitive small person managed to unscrew it completely. If that ring is removed the front element comes out followed by the second element sitting in a steel spacer disc. Below that is the aperture blade wheel/cog/slotted disc thingy which can also just about come out without removing its locating pin if the lens is at the right (or maybe the wrong) angle and maybe shaken a bit 😟.....fortunately over a sofa. I had to remove the displaced aperture blades before they came to any more harm and then loosely reassemble the lens before it could be sent off. Link to post Share on other sites More sharing options...
tester23 Posted August 13, 2019 Author Share #31 Posted August 13, 2019 2 hours ago, NigelG said: I have a v4 German copy which is currently with Leica being reassembled could you share what's the range of budget that Leica asked for it? 4 hours ago, lct said: Not the same lens as mine (1st pic). This one is in fact broken. It is a Canadian copy too so i wonder if German ones have those plastic parts as well. yes, it seems that the whole lens tube is made of plastic as well as aperture ring and front face. In fact.... that's a lot of plastic for this price 1 Link to post Share on other sites More sharing options...
tester23 Posted August 13, 2019 Author Share #32 Posted August 13, 2019 this one looks like mine except i do not have any screws near the aperture ring 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 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=3796907'>More sharing options...
NigelG Posted August 14, 2019 Share #33 Posted August 14, 2019 (edited) 21 hours ago, tester23 said: could you share what's the range of budget that Leica asked for it? yes, it seems that the whole lens tube is made of plastic as well as aperture ring and front face. In fact.... that's a lot of plastic for this price It’s of the order of €400 Euro (depending on what woeful £ exchange rate is used) including full CLA Edited August 14, 2019 by NigelG Clarity 1 Link to post Share on other sites More sharing options...
tester23 Posted August 14, 2019 Author Share #34 Posted August 14, 2019 @nigelg thanks - useful info Link to post Share on other sites More sharing options...
weihsuan Posted August 24, 2021 Share #35 Posted August 24, 2021 (edited) Sorry for reviving an old thread. I have a German copy which has a loose focusing tab. May I know if the steps as described in previous post #13 are useful in helping to access the screw holding onto the focusing tab? And if I may, request some pictorial guides to go along. Thank you all in advance. Edited August 24, 2021 by weihsuan Link to post Share on other sites More sharing options...
tester23 Posted August 24, 2021 Author Share #36 Posted August 24, 2021 @weihsuan It sounds like you want to practice the lens disassembly on the summicron It's not recommended because of risk that you will have to pay premium for the rebuild or damage it permanently. Having said above, if you remove the back screw and the bayonet, you will discover that helicoids are disengaged. If you turn the optical block, you will notice it's getting out of the bigger helicoid. Finally you will have two pieces: lens outer shell and lens optical block separately. At this moment you will understand that you are screwed and need to pay for the lens rebuild to the pro, or you did plenty of photos and marked the exact location at which helicoids were separated (E X A C T). Anyway, you will see how the focusing ring is held with 3 screws (as far as I remember) - probably you want to slightly tighten them. What is weird, is that these screws are held in place with glue. If they moved it means someone was there before you and didn't replace the glue during assembly. Link to post Share on other sites More sharing options...
weihsuan Posted August 24, 2021 Share #37 Posted August 24, 2021 7 minutes ago, tester23 said: @weihsuan It sounds like you want to practice the lens disassembly on the summicron It's not recommended because of risk that you will have to pay premium for the rebuild or damage it permanently. Having said above, if you remove the back screw and the bayonet, you will discover that helicoids are disengaged. If you turn the optical block, you will notice it's getting out of the bigger helicoid. Finally you will have two pieces: lens outer shell and lens optical block separately. At this moment you will understand that you are screwed and need to pay for the lens rebuild to the pro, or you did plenty of photos and marked the exact location at which helicoids were separated (E X A C T). Anyway, you will see how the focusing ring is held with 3 screws (as far as I remember) - probably you want to slightly tighten them. What is weird, is that these screws are held in place with glue. If they moved it means someone was there before you and didn't replace the glue during assembly. Thank you for this! Appreciate your comments. I was trying to find out the complexity in reaching that screw, which obviously is quite a bit of my ability. I'll look for a competent repairman for this. 👍 Link to post Share on other sites More sharing options...
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