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pirius
Joined: 28 May 2009
Posts: 134
Location: SoFla
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 Posted: Mon Dec 13, 2010 7:33 pm Post subject: Disassembling Meyer-Optik Primoplan 58/1.9 |
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pirius wrote:
I am trying to clean the internal glass on a newly acquired Primoplan 58/1.9 and I am having problems with disassembling the front part of it. It seems pretty straightforward at first but I can't figure out how to remove the front nameplate. Any ideas? Thanks... |
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Attila
Joined: 24 Feb 2007
Posts: 57939
Location: Hungary
Expire: 2021-11-18
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| Posted: Mon Dec 13, 2010 7:44 pm Post subject: |
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Attila wrote:
Click here to see on Ebay
You need this tool or sink stopper (plug) what has exact diameter and made from hard gum.
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pirius
Joined: 28 May 2009
Posts: 134
Location: SoFla
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| Posted: Mon Dec 13, 2010 9:12 pm Post subject: |
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pirius wrote:
Yeah, that's the one thing that I still don't have. However, I look at the nameplate ring (it is actually a large conical part like in many macro lenses) and it looks like that thread on the filter ring above it is narrower and won't let the ring to come off. I guess it's just an optical illusion  |
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pirius
Joined: 28 May 2009
Posts: 134
Location: SoFla
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| Posted: Tue Dec 14, 2010 5:27 am Post subject: |
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pirius wrote:
Update: I was right... The nameplate could only be removed with the front filter ring as a single item. After the small retaining screw on the inner side of the front ring is removed, the entire front part can be unscrewed, which gives the access to the front optical unit. Unscrew that one and you get straight to the diaphragm. The rear optical assembly can also be easily removed with a lens wrench so the diaphragm becomes accessible from both sides. |
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Attila
Joined: 24 Feb 2007
Posts: 57939
Location: Hungary
Expire: 2021-11-18
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| Posted: Tue Dec 14, 2010 1:29 pm Post subject: |
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Attila wrote:
| pirius wrote: |
| Update: I was right... The nameplate could only be removed with the front filter ring as a single item. After the small retaining screw on the inner side of the front ring is removed, the entire front part can be unscrewed, which gives the access to the front optical unit. Unscrew that one and you get straight to the diaphragm. The rear optical assembly can also be easily removed with a lens wrench so the diaphragm becomes accessible from both sides. |
It would be nice if you take photos from each steps and publish it here, I think some people will happy to read it and use it when need it. Many thanks in advance!
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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pirius
Joined: 28 May 2009
Posts: 134
Location: SoFla
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| Posted: Tue Dec 14, 2010 2:20 pm Post subject: |
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pirius wrote:
Sorry, I have already assembled it back. But it's easy, there is not much to show. If you look inside the lens from the front you'll see a tiny screw. Loosen it up, then grab the front part of the lens firmly (the filter ring) and unscrew it counter-clockwise. After that it's just a regular disassembly with a spanner wrench.
So the rubber tool was not necessary, but I have ordered it anyway
BTW, I've tried the lens and I think it's awesome! |
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Attila
Joined: 24 Feb 2007
Posts: 57939
Location: Hungary
Expire: 2021-11-18
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| Posted: Tue Dec 14, 2010 2:41 pm Post subject: |
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Attila wrote:
| pirius wrote: |
Sorry, I have already assembled it back. But it's easy, there is not much to show. If you look inside the lens from the front you'll see a tiny screw. Loosen it up, then grab the front part of the lens firmly (the filter ring) and unscrew it counter-clockwise. After that it's just a regular disassembly with a spanner wrench.
So the rubber tool was not necessary, but I have ordered it anyway
BTW, I've tried the lens and I think it's awesome! |
 No problem, rubber tool is useful. I like this lens too pretty much, congrats for your new tool.
Try to hunting down Helioplan 40mm or 4cm from Meyer it has even better IQ 
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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valjo
Joined: 10 Oct 2008
Posts: 68
Location: Bulgaria
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| Posted: Sat Apr 19, 2014 5:13 pm Post subject: |
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valjo wrote:
| pirius wrote: |
| Update: I was right... The nameplate could only be removed with the front filter ring as a single item. After the small retaining screw on the inner side of the front ring is removed, the entire front part can be unscrewed, which gives the access to the front optical unit. Unscrew that one and you get straight to the diaphragm. |
| pirius wrote: |
| ... If you look inside the lens from the front you'll see a tiny screw. Loosen it up, then grab the front part of the lens firmly (the filter ring) and unscrew it counter-clockwise. After that it's just a regular disassembly with a spanner wrench. |
I have removed the small retaining screw on the inner side of the front ring but the front part can NOT be unscrewed. I have tried to unscrew it counter-clockwise firmly as i can.
My intention is to clean the diaphragm from excessively oiling.
What to do?
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