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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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 Posted: Sun Dec 21, 2008 10:12 pm Post subject: I repaired my first lens today... |
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Spotmatic wrote:
Maybe nothing important, but a few weeks ago I got this nice Meyer Primotar 180mm f/3.5 lens for next to nothing (to me at least) -- 10 euros. It came to me in this shape, including the Meyer lens case and both original lens covers:
So what was wrong with it? Basically, the diaphragm was stuck. It would not move at all. The former owner tried to use a little too much force, with this as a result:
So I disassembled the front group, and that was very, very easy to do. No screws had to be removed at all. When I reached the blades it was clear that they were sticking to each other, in such a way that they came out of the lens in one piece. I cleaned them in a bath of naphta, dried them and put them back into the lens.That actually was the hardest part, I had to try 3 times before I knew how to do it 
I could understand why some prefer 6-blade diaphragms, from a repairer's point of view
And here is the result:
Not bad for 10 euros and a little work, eh? 
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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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piticu
Joined: 04 Aug 2008
Posts: 591
Location: Romania
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| Posted: Sun Dec 21, 2008 10:16 pm Post subject: |
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piticu wrote:
Great job! I've almost cried when i tried to put back a 5 blades iris
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Dec 21, 2008 10:19 pm Post subject: |
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Attila wrote:
Great job! Nice to see you saved this poor guy life!
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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Sun Dec 21, 2008 10:42 pm Post subject: |
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Jesito wrote:
Congrats, nice job done!.
And thanks for sharing,
Jes.
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Sun Dec 21, 2008 11:48 pm Post subject: |
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Farside wrote:
Excellent work. I'm good at taking them apart.
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indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
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| Posted: Mon Dec 22, 2008 1:27 am Post subject: |
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indianadinos wrote:
Hello,
Really nice work ...
Now, what about posting some sample pictures ?
Best regards
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Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
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Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
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... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Mon Dec 22, 2008 7:44 am Post subject: |
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Spotmatic wrote:
Thanks everyone! It certainly is very rewarding to repair a defective lens - no matter how cheap or how expensive it is. Of course, I repaired it to try it out, and that will happen soon. Check back in a few days
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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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peterqd
Joined: 28 Feb 2007
Posts: 7448
Location: near High Wycombe, UK
Expire: 2014-01-04
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| Posted: Mon Dec 22, 2008 10:11 am Post subject: |
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peterqd wrote:
It's really easy and all goes well until.. you discover you have to lift up the first blade you laid to slide one underneath! Wow, I've never tried one as complex as this - I'm lost in admiration of your patience!
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koji
Joined: 21 Jul 2008
Posts: 2106
Location: Hiroshima, Japan
Expire: 2012-12-27
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| Posted: Mon Dec 22, 2008 10:08 pm Post subject: |
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koji wrote:
| Spotmatic wrote: |
| ...! It certainly is very rewarding to repair a defective lens - no matter how cheap or how expensive it is. ... |
I totally (means 120%) agree with this statement.  
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woodrim
Joined: 14 Jan 2010
Posts: 4060
Location: Charleston
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| Posted: Sun Aug 21, 2016 6:15 pm Post subject: |
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woodrim wrote:
Hello Peter: Old post, but right subject. You said "No screws had to be removed at all". I've tried unscrewing the front, but didn't want to force without knowing more. Can you please tell me how exactly to remove the front? I have one blade that just went out of position. Looking, it appears an easy slip back into position if I can access from the front.
Thanks much.
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Woodrim |
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konicamera
Joined: 03 May 2009
Posts: 746
Location: Warsaw, Poland
Expire: 2014-06-14
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| Posted: Sun Aug 21, 2016 7:23 pm Post subject: |
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konicamera wrote:
| woodrim wrote: |
Hello Peter: Old post, but right subject. You said "No screws had to be removed at all". I've tried unscrewing the front, but didn't want to force without knowing more. Can you please tell me how exactly to remove the front? I have one blade that just went out of position. Looking, it appears an easy slip back into position if I can access from the front.
Thanks much. |
+1
I would also love to see how you accessed the aperture blades. I have two lenses from this maker - this Primotar 180mm and the 300 Telemegor - and their apertures are in the same condition yours was in. There must be some design flaw there, for I've seen many older MOG lenses wth this condition.
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woodrim
Joined: 14 Jan 2010
Posts: 4060
Location: Charleston
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| Posted: Sun Aug 21, 2016 9:03 pm Post subject: |
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woodrim wrote:
Just found my way through it. The front most ring does unscrew. The lens needs a little more effort and has those opposing notches for a tool. Once inside I was able to reposition the renegade blade, but seems maybe slightly bent. Testing it revealed that it will come out again if turned past f/5.6. My cure was to set the perture stop at f/5.6 and never go beyond. I use it mostly at wide open anyway.
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Woodrim |
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