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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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 Posted: Wed Oct 12, 2011 7:10 pm Post subject: Disassembling the rear element group of Yashica 50/1.4 |
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symphonic wrote:
My friend is trying to disassemble and clean a Yashica ML 50/1.4 and he managed to do it all, but the rear element group, which is enclosed in a metal frame with no screws, depicted here:
Is there a tool for disassembling things like that and what's the usual way of doing it?
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Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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| Posted: Fri Oct 14, 2011 4:09 pm Post subject: |
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symphonic wrote:
I guess silence means that nobody has any clue on how to approach this?
Sorry if the pics aren't very explanatory, but I guess they show what matters. He says he tried forcing the metal rings out by turning with no success.
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Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Fri Oct 14, 2011 4:18 pm Post subject: |
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Spotmatic wrote:
Basically we need sharper pictures 
That 'slit' running through the middle, does it unscrew there?
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Peter - Moderator
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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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| Posted: Fri Oct 14, 2011 4:35 pm Post subject: |
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symphonic wrote:
| Spotmatic wrote: |
Basically we need sharper pictures
That 'slit' running through the middle, does it unscrew there? |
Thanks for the reply.
He said he tried "unscrewing" it there at the middle, forcing it as hard as possible by hands, but it didn't budge. Hopefully I'll add better pics soon.
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Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Fri Oct 14, 2011 4:50 pm Post subject: |
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Spotmatic wrote:
Disassembling lenses is not that hard, especially standard lenses are easy (at least the most of them). You're sure there's not a screw ring at one of the sides?
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Fri Oct 14, 2011 6:14 pm Post subject: |
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Attila wrote:
I met a couple of times similar glued lens block I think no way to open it at home safely.
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ZoneV
Joined: 09 Nov 2009
Posts: 1632
Location: Germany
Expire: 2011-12-02
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| Posted: Mon Oct 17, 2011 9:59 am Post subject: |
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ZoneV wrote:
I would search if I could find glue traces in that slit.
If I remember right, I could open someting like that after scratching the glue away - with some force.
To get more force, I like to use a bicycle tube - best with your hands only. With much higher risk of damage with two pipe wrenches - but this way you could damage event the lens itself - could break.
Probably you could use acetone to open up the glue?
But there is the risk, that the acetone goes into that group, and fogging a lens there inside - but without dissolving the glue - total damage of the lens.
Or you could try to break the glue with heat - but I think that is risky too.
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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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| Posted: Sun Oct 23, 2011 8:55 am Post subject: |
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symphonic wrote:
| ZoneV wrote: |
Or you could try to break the glue with heat - but I think that is risky too. |
That is precisely what he did and managed to open it up. He heated it up with a lighter and it screwed off with no hassle.
Thanks all for chiming in. 
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Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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ChromaticAberration
Joined: 23 Dec 2010
Posts: 819
Location: Portugal
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| Posted: Sun Oct 23, 2011 12:00 pm Post subject: |
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ChromaticAberration wrote:
Yeah I think this is going to be a near impossible task due to the japanese tradition of gluing elements together. I have CLA'd the 28mm ML version and I was also not able to reach some places due to glued elements.
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qwerty97
Joined: 26 Oct 2011
Posts: 8
Location: Belarus
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| Posted: Wed Oct 26, 2011 10:37 am Post subject: |
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qwerty97 wrote:
I have been disassembling rear part of Cosinon 50mm 1.4 wich is similiar. Just took bottom part (picture 2) in one hand, up part in another and unscrewed it. Not much force needed and no glue inside. |
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