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Meyer Oreston 50 1,8: lost rear group centering
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PostPosted: Mon Nov 16, 2015 3:44 pm    Post subject: Meyer Oreston 50 1,8: lost rear group centering Reply with quote
Hello to everybody; during a cleaning ang greasing of my Oreston, I had the bad idea to unscrew the three screws that keep centered the rear group of glass; I thought that like in all other lenses I have seen so far, the group was just screwed up, and the small screws having the function to avoid unwanted unscrewing; instead, the group is kept in the right place ONLY from the already said 3 screws, that have to be individually adjusted to empirically center it. Of course the only way to retrieve the correct centering would be an interferometer, that obviously I don't have. So, before I make a paperweight of my Oreston, I was wondering if anyone has ever had the same problem, and if it is any trick to save this lens.

Thanks in advance.


PostPosted: Tue Nov 17, 2015 1:28 pm    Post subject: Reply with quote
If you could fit it to a slide projector then you can make centering adjustments whilst looking at the projected image, not easy but it does work.


PostPosted: Tue Nov 17, 2015 3:24 pm    Post subject: Reply with quote
Ramon wrote:
If you could fit it to a slide projector then you can make centering adjustments whilst looking at the projected image, not easy but it does work.


Thanks, not bad. I must say that when I visited tle Leica factory in 2004, they were checking the lenses (in the last step), observing a slide projected by a projector with a custom made rotating mount... the problem is that the screws are accessible only by removing the lens mount, so no much better than shoot and check with my Canon; BTW I could try to mount the lens inverted, by its filter thread, so that I have free access to the screws... Good starting point! TY!


PostPosted: Tue Nov 17, 2015 5:30 pm    Post subject: Reply with quote
Ultrapix wrote:
I could try to mount the lens inverted, by its filter thread, so that I have free access to the screws... Good starting point! TY!


That is how I do it. I have an old projector that I have modified with a Canon EOS lens mount.
Having a few different EOS lens adaptors it enables me to fit a variety of different lenses and by using an EOS to PK adaptor then a PK reverse adaptor I can fit any lens in reverse by using filter mount step rings if necessary.


Good Luck and let us know how you get on.
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