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enzodm
Joined: 11 Sep 2010
Posts: 350
Location: Italy
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 Posted: Sat Dec 08, 2012 3:14 pm Post subject: Adjusting infinity focus on Mir 20/3.5 |
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enzodm wrote:
Hi,
I bought a Mir 20/3.5 that is unable to focus over one meter or so. I waited too much to send it back to seller, so I have to live with it. Price was not excessive, fortunately.
I already tried to reverse back lens, but cannot be put on the other side (convex).
Is there any easy way to adjust infinity?
Thanks!
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
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enzodm
Joined: 11 Sep 2010
Posts: 350
Location: Italy
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| Posted: Sun Dec 09, 2012 9:36 am Post subject: |
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enzodm wrote:
Mmmm... difficult question? 
I add an information: seller told me that it was serviced, and maybe the technician did something wrong.
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
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Zsolt
Joined: 24 Dec 2012
Posts: 8
Location: HUNGARY
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| Posted: Mon Jan 07, 2013 10:51 pm Post subject: infinity adjustement |
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Zsolt wrote:
Hi,
May I would try to loose the front cover ring (nameplate). After that please take a picture what is including under that. You can remove it by a rubber O-ring or rubber donut. You can turn it on CCW direction. If it is not goes don't force over. It is possible to remove not hardly. Be carefully, don't scratch the lens. After you shared the picture you can get more help. Basically it would be not a difficult process.
BR,
Zsolti
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Zsolti |
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Aanything
Joined: 27 Aug 2011
Posts: 2187
Location: Piacenza, Italy
Expire: 2014-05-30
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| Posted: Mon Jan 07, 2013 11:08 pm Post subject: |
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Aanything wrote:
I adjusted the one on mine, there's a little margin, but it may not be enough.
Anyway, i don't remember well but it was really easy: badically you have to unscrew three screws that couple the outer ring with the helicoid, turn the outer ring and then re tighten the screws. If you can't find how to do it, tomorrow I can try to be more precise.
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Aanything
Joined: 27 Aug 2011
Posts: 2187
Location: Piacenza, Italy
Expire: 2014-05-30
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| Posted: Mon Jan 07, 2013 11:11 pm Post subject: Re: infinity adjustement |
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Aanything wrote:
| Zsolt wrote: |
Hi,
May I would try to loose the front cover ring (nameplate). After that please take a picture what is including under that. You can remove it by a rubber O-ring or rubber donut. You can turn it on CCW direction. If it is not goes don't force over. It is possible to remove not hardly. Be carefully, don't scratch the lens. After you shared the picture you can get more help. Basically it would be not a difficult process.
BR,
Zsolti |
If his lens is the same as mine it doesn't have a name plate, and the frontmost part is Held by 3 screws.
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C&C and editing of my pics are always welcome
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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 Jan 07, 2013 11:35 pm Post subject: Re: Adjusting infinity focus on Mir 20/3.5 |
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peterqd wrote:
| enzodm wrote: |
| I bought a Mir 20/3.5 that is unable to focus over one meter or so. |
Which means the lens block is too far from the sensor. It sounds like the helicoil is mis-threaded to me.
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