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Orthoplan Focus Mechanism

 
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Rainowman



Joined: 26 Nov 2017
Posts: 1

PostPosted: Tue Feb 11, 2020 4:43 am    Post subject: Orthoplan Focus Mechanism Reply with quote

I have encountered a technical problem with my Orthoplan focussing mechanism. In the middle of a session the coarse focus control suddenly became stiff almost to the point of being seized.

I have stripped the components down and removed the focus assembly but I have hit snags. I have removed the screws from either end of the fine focus knobs but they will not withdraw even though they rotate freely. I have removed the retaining bolt which retains the shaft of gears linking the worm drive with the coarse focus knobs but it will only withdraw about 2mm.

Also there are plates either side of the mechanism with red paint 'seals' on them which I am reluctant to undo without knowing where I am heading.

Has anybody any knowledge or experience of this problem or suggestions as to how I can dismantle the mechanism to get at the main shaft bearing, which I suspect may be the source of the fault. Also does anybody know which grease is best to use during re-assembly.

Alternatively can anyone recommend a repairer in the UK who is likely to have experience of this problem.







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Perl



Joined: 03 Oct 2006
Posts: 262
Location: Sweden

PostPosted: Wed Feb 12, 2020 12:51 am    Post subject: Orthoplan Focus ! Reply with quote

Hi

Buy a New One

Regards
Pär
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Rorschach



Joined: 08 Mar 2019
Posts: 112
Location: Finland

PostPosted: Tue Mar 24, 2020 1:30 am    Post subject: Reply with quote

There are advanced Leitz hobbyists who renovate these magnificient focus blocks to good as new condition. There's one in the UK and another one in Germany. Maybe more. They advertise on Ebay every now and then.

I would NOT advice to try to disassemble and renovate that thing by yourself and would certainly never try it myself, even though I'm known to tinker with scopes and do fixing..."A man has got to know his limitations" Very Happy
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Perl



Joined: 03 Oct 2006
Posts: 262
Location: Sweden

PostPosted: Tue Mar 24, 2020 1:33 am    Post subject: Reply with quote

Hi
Have on extra for sale if you want ?
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Rorschach



Joined: 08 Mar 2019
Posts: 112
Location: Finland

PostPosted: Thu Mar 26, 2020 3:06 am    Post subject: Reply with quote

Thanks Pär, but I already have an excellent one, plus another good one as a spare. So I'm covered.
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