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cyberjunkie
Joined: 24 Mar 2010
Posts: 282
Location: Chiang Mai, Bologna, Amsterdam
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 Posted: Tue Dec 06, 2016 5:44 am Post subject: Tighten focusing ring on Pentacon 135mm Auto MC |
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cyberjunkie wrote:
I own two Pentacon f/2,8 135mm lenses, both are the same: the latest auto MC version.
The best one (that i would like to keep) has a little problem:
the focusing ring turns the helicoid only if clamped with some force, if turned using fingertips it just slips, without affecting focus.
I looked for screws but none of those i found tightens the focusing ring.
Any clue?
Thanks in advance
Paolo
_________________
Pentax Bodies: 6x7, K2, MX, LX, Super A, Z-1, K-1, K-5 II, K-01, K10D, K200D
Other cameras: Leica CL, Leica M5, Rolleiflex, Mamiya Super 23, Horizont, and many bellows cameras from 4x5" to 8x10"
- Shooting only digital recently, FF and APS-C
- Collecting vintage large format lenses (plenty of them  )
- Looking for Pentax-A* 200mm Macro and Pentax-A* 1.8/135mm, Sigma 150mm or 180mm Macro PK, Sigma 50-500 AF PK, Enna 1.5/85mm M42; selling Pentacon Six/Pentax 67/Mamiya Press/Leica M/Rolleiflex/4x5"/Manfrotto stuff
MY BELOVED PK, M42 LENSES
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tomasg
Joined: 01 Nov 2009
Posts: 1135
Expire: 2014-04-28
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| Posted: Wed Dec 07, 2016 9:25 am Post subject: |
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tomasg wrote:
If i understand the focusing is stiff and you have to grip it tightly to turn the focusing ring, otherwise your hand slips around it? If this is correct then the focusing mechanism (helicoids) need to be re-lubed. From my experience, removing the focusing ring only most probably won t be enough to do that. I don t advise you to, but if you really want to try it, have you looked under the rubber band?
Tomas |
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cyberjunkie
Joined: 24 Mar 2010
Posts: 282
Location: Chiang Mai, Bologna, Amsterdam
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| Posted: Wed Dec 07, 2016 11:39 am Post subject: |
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cyberjunkie wrote:
no, the helicoid is perfectly lubed. It's just the ring that slips.
I guess that the screws should be tightened, but i couldn't find them.
I don't have the lens with me, but as far as i remember there is no rubber ring... other way i'd have tried to take it out and look underneath.
cheers
Paolo
_________________
Pentax Bodies: 6x7, K2, MX, LX, Super A, Z-1, K-1, K-5 II, K-01, K10D, K200D
Other cameras: Leica CL, Leica M5, Rolleiflex, Mamiya Super 23, Horizont, and many bellows cameras from 4x5" to 8x10"
- Shooting only digital recently, FF and APS-C
- Collecting vintage large format lenses (plenty of them )
- Looking for Pentax-A* 200mm Macro and Pentax-A* 1.8/135mm, Sigma 150mm or 180mm Macro PK, Sigma 50-500 AF PK, Enna 1.5/85mm M42; selling Pentacon Six/Pentax 67/Mamiya Press/Leica M/Rolleiflex/4x5"/Manfrotto stuff
MY BELOVED PK, M42 LENSES
Photographica sets
On sale |
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