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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Thu Jun 27, 2019 2:01 am Post subject: ??? Disassembly of Meyer Primotar 50mm f/3.5 ??? |
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gawn_dijitul wrote:
I recently purchased a Meyer-Optik Gorlitz Primotar 50mm f/3.5. Cosmetically, it's beautiful. Optically, it has a lot of internal dust and some lint. More importantly, it has the beginnings of two types of internal fungus. This example was manufactured in 1956 or '57.
QUESTION: Is there a link to disassembly instructions for this lens?
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Thu Jun 27, 2019 6:05 am Post subject: Re: ??? Disassembly of Meyer Primotar 50mm f/3.5 ??? |
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Sciolist wrote:
There you go. An anti-spam measure stops images being produced on first post.
Last edited by Sciolist on Thu Jun 27, 2019 4:24 pm; edited 1 time in total |
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Thu Jun 27, 2019 1:36 pm Post subject: Re: ??? Disassembly of Meyer Primotar 50mm f/3.5 ??? |
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gawn_dijitul wrote:
Sciolist wrote: |
There you go. An anti-spam measure stops images being produced on first post. |
Thank you Sciolist. I was wondering why the image wouldn't show. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Thu Jun 27, 2019 3:44 pm Post subject: |
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visualopsins wrote:
Welcome gawn_dijitul
You might find useful info here http://forum.mflenses.com/basic-techniques-to-repair-lenses-and-cameras-t32862.html _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200
Tele-Takumar 1:5.6/200, 1:6.3/300
Macro-Takumar 1:4/50
Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm
Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element),
Super-Multi-Coated Fisheye-TAKUMAR 1:4/17
Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500
Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100
Super-Multi-Coated Bellows-TAKUMAR 1:4/100
SMC TAKUMAR 1:1.4/50, 1:1.8/55
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Wed Aug 28, 2019 4:58 am Post subject: Diagram |
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gawn_dijitul wrote:
Maybe someone knows where I can find a diagram? |
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Sun Sep 01, 2019 10:35 pm Post subject: |
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gawn_dijitul wrote:
I really need to clean this lens. |
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Mon Sep 02, 2019 11:46 am Post subject: |
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Sciolist wrote:
gawn_dijitul wrote: |
I really need to clean this lens. |
I'm not being flippant here gawn, but an idea might be to buy a cheap basket case. Then take it apart without fear, and in the process become the expert in the maintenance of these lenses. |
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Mon Sep 02, 2019 1:33 pm Post subject: |
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gawn_dijitul wrote:
Sciolist wrote: |
I'm not being flippant here gawn, but an idea might be to buy a cheap basket case. Then take it apart without fear, and in the process become the expert in the maintenance of these lenses. |
Great idea. Thank you!! |
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jamaeolus
Joined: 19 Mar 2014 Posts: 2913 Location: Eugene
Expire: 2015-08-20
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Posted: Mon Sep 02, 2019 4:44 pm Post subject: |
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jamaeolus wrote:
I am not familiar with this particular lens but most German lenses of that era that I have opened were simple. Typically a series of threaded tubes with lens elements sandwiched via flanges. Do you have rubber bezel wrenches? Also will likely need a lens spanner. On some lenses you have to remove an outer tube by removing grub screws. Is most of the issue with the front group? If so I would go at it from the top. So a typical disassembly would be: remove name bezel with a rubber bezel wrench. These can be purchase d from Japan Toy and Hobby. They also sell the lens wrenches. Sometimes they can just be spun off withjust fingertips. But on a lens this old that is unlikely. Less effective but possibly useful would be a homemade system using a plastic tube and rubber sheet, like a latex glove over pvc plumbing chosen to match the diameter of the bezel. Next up would be spinning a lens group out of the outer tube. This is where you would need the spanner. You will see 2 slots on opposites sides of the mounting bezel. Matching the spanner fitting with the groove and the spanner width to the diameter of the bezel. I do not recommend using anything other than a spanner wrench. I have tried scissors and ruined a lens element. Always set up on a clean white sheet of cloth or paper and take care to match orientation of elements when re-assembling. Blue painters tape can be used to mark the side of the lens toward the outside. Do not leave it on for any longer than necessary as it could potentially damage the coating of the lens. Good luck. _________________ photos are moments frozen in time |
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Mon Sep 02, 2019 5:22 pm Post subject: |
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gawn_dijitul wrote:
jamaeolus wrote: |
I am not familiar with this particular lens but most German lenses of that era that I have opened were simple. Typically a series of threaded tubes with lens elements sandwiched via flanges. Do you have rubber bezel wrenches? Also will likely need a lens spanner. On some lenses you have to remove an outer tube by removing grub screws. Is most of the issue with the front group? If so I would go at it from the top. So a typical disassembly would be: remove name bezel with a rubber bezel wrench. These can be purchase d from Japan Toy and Hobby. They also sell the lens wrenches. Sometimes they can just be spun off withjust fingertips. But on a lens this old that is unlikely. Less effective but possibly useful would be a homemade system using a plastic tube and rubber sheet, like a latex glove over pvc plumbing chosen to match the diameter of the bezel. Next up would be spinning a lens group out of the outer tube. This is where you would need the spanner. You will see 2 slots on opposites sides of the mounting bezel. Matching the spanner fitting with the groove and the spanner width to the diameter of the bezel. I do not recommend using anything other than a spanner wrench. I have tried scissors and ruined a lens element. Always set up on a clean white sheet of cloth or paper and take care to match orientation of elements when re-assembling. Blue painters tape can be used to mark the side of the lens toward the outside. Do not leave it on for any longer than necessary as it could potentially damage the coating of the lens. Good luck. |
Thank you for the very helpful advice.
Rubber bezel wrenches might be necessary... I'll buy a set. I have a good spanner wrench. Some of these old German classics have a pry-off front bezel. This one doesn't seem to unless it's very tight. There are no grub screws. I can't turn the front ring with finger tips alone. So... the next step is rubber bezel wrenches... or... I could superglue my fingertips to the bezel.😁 |
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Mon Sep 02, 2019 7:34 pm Post subject: |
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Sciolist wrote:
gawn_dijitul wrote: |
... or... I could superglue my fingertips to the bezel.😁 |
Or wear a pair of rubber washing-up gloves and use your thumbs. For the most stubborn bezels I will dab a cotton bud (Q-tip) in wd40 and run it around the gap where bezel meets lens body (into the threads therefore). Then try and loosen each day until it relents. Be as sparing as you can with the wd40 and remember to clean it off once the bezel unscrews. |
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jamaeolus
Joined: 19 Mar 2014 Posts: 2913 Location: Eugene
Expire: 2015-08-20
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Posted: Tue Sep 03, 2019 2:10 am Post subject: |
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jamaeolus wrote:
Super glue? I wouldn't recommend that. I have used blue tak. It's flexible silly putty like stuff. I form it into a thin gasket, just the right size. It will ooze into the letters . It worked ok. It comes off without damaging the lens. _________________ photos are moments frozen in time |
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jamaeolus
Joined: 19 Mar 2014 Posts: 2913 Location: Eugene
Expire: 2015-08-20
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Posted: Tue Sep 03, 2019 3:21 pm Post subject: |
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jamaeolus wrote:
here is an example of a lens spanner wrench:
https://www.ebay.com/itm/Professional-DSLR-Camera-Lens-Repair-Spanner-Wrench-Open-Tool-Sets-3-Tip-Kit-US/383077132435?hash=item59312d2893:g:XIoAAOSwgO9dP9TK
This is the one I have. Its OK.
I don't see an example of the type of bezel wrench set I use but here is a similar set:
https://www.ebay.com/itm/9in1-Camera-Lens-Repair-Tool-Rubber-Set-Ring-Filter-Removal-Spanner-Wrench-DSLR/272698200702?hash=item3f7e14527e:g:C8MAAOSwyZZcoC1R
As far as cheap practice lenses I would try to find a Meyer Domiplan from the same era. They aren't generally well regarded and thus don't command high prices. That plus it being a meye product means systems are likely to be similar. _________________ photos are moments frozen in time |
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gawn_dijitul
Joined: 08 Jan 2019 Posts: 10 Location: United States
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Posted: Tue Sep 03, 2019 3:30 pm Post subject: |
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gawn_dijitul wrote:
Thank you jamaeolus. I'll have a look at those links. |
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Airman
Joined: 10 Nov 2018 Posts: 25 Location: World
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Posted: Wed Jan 27, 2021 12:31 pm Post subject: |
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Airman wrote:
Hi,
I found some fungus in the rear element. There are 3 screws centering the element. I read somewhere that I should never touch them because later it’s just impossible to align :/
Any hints? |
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georgegrant
Joined: 25 Jan 2021 Posts: 16 Location: Chongqing, China
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Posted: Thu Jan 28, 2021 6:58 pm Post subject: |
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georgegrant wrote:
Do not under any circumstances replace the grease when putting it back together - I did that on a Trioplan and it ruined the aperture after a few months (oil). Really, as tempting as it is to clean up the old grease - don't. As for centering issues etc - I never worked on that particular lens, but if it's anything like the trioplan or helioplan then just take proper photos of the alignment, set marks and you should be fine. If not you end up with a vintage tilt-shift |
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Ultrapix
Joined: 06 Jan 2012 Posts: 547 Location: Italy
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Posted: Thu Jan 28, 2021 7:24 pm Post subject: |
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Ultrapix wrote:
Airman wrote: |
Hi,
I found some fungus in the rear element. There are 3 screws centering the element. I read somewhere that I should never touch them because later it’s just impossible to align :/
Any hints? |
Yep, I had this problem with an Oreston. |
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