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sammo
Joined: 04 Jan 2012
Posts: 223
Location: CH and SI
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 Posted: Tue Jun 25, 2013 3:21 pm Post subject: Carl Zeiss Jena lenses infinity focus calibration |
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sammo wrote:
I have dissasembled quite a lot of lenses, calibrated infinity, set the parfocality of a zoom, etc. But I have yet to figure out how to calibrate infinity on Carl Zeiss Jena (M42) lenses? Does anybody know where is the trick? |
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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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| Posted: Fri Jul 12, 2013 2:52 pm Post subject: |
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Gonzoo wrote:
Depends on which lens you are talking about, there is a lot of Zeiss glass out there 
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Srdjan
Joined: 11 Apr 2012
Posts: 316
Location: Nis
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| Posted: Mon Nov 25, 2013 8:39 pm Post subject: |
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Srdjan wrote:
It is very easy if you now what are you doing. If you dissemble lens, just mark positions so you not lose time to find it later. But if you forgot it and didn't market, again it is easy just need more times to find infinity position.
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sammo
Joined: 04 Jan 2012
Posts: 223
Location: CH and SI
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| Posted: Mon Dec 02, 2013 7:21 pm Post subject: |
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sammo wrote:
I know hot to dissaseble and reassemble. The problem is, I can set infinity by droping the helicoids together at different postitions, or screw/unscrew the thin focus ring for 1 turn. But, this is all changing only in discrete steps. How is is possible to change the focus in very small amounts, as with usual lenses, where the focus ring is loosened from the front and just shifted to another position?
As for the other post Gonzoo, I am talking about newer M42 Zeiss lenses (non-zebra), Tessar, Sonnar, Pancolar, Flektogon... |
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Srdjan
Joined: 11 Apr 2012
Posts: 316
Location: Nis
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| Posted: Tue Dec 03, 2013 7:28 am Post subject: |
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Srdjan wrote:
The only way is as you mentioned, assembling helicoids together at different positions or focus ring. The other way from front is only possible with Carl Zeiss lens made in West German, but not with Jena ones. But I newer have problem with it, you can easy find infinity position.
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sammo
Joined: 04 Jan 2012
Posts: 223
Location: CH and SI
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| Posted: Tue Dec 03, 2013 7:35 am Post subject: |
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sammo wrote:
There has to be another way. They were somehow calibrated at the factory. |
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Aanything
Joined: 27 Aug 2011
Posts: 2201
Location: Piacenza, Italy
Expire: 2014-05-30
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| Posted: Tue Dec 03, 2013 8:24 am Post subject: |
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Aanything wrote:
| sammo wrote: |
| There has to be another way. They were somehow calibrated at the factory. |
That's what I thought too.
But after many tries and some research I gave up.
If you find something please share it here.
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