Meopta Opemus III enalrger

[DDME]

You might try Photoimpex in Berlin for lens mounts and other parts for Meopta. I have used them for a Meopta lens mount to fit a 40 mm Rodenstock.
https://www.fotoimpex.de/shopen/

 

[Blackwhitemultiforma]

To answer your last question first: the Opemus III model was produced between 1969 and 1975 (see http://www.meoptahistory.com/?id=312).
The manual for it appears to be downloadable from several Internet sites (for money), but the "III" doesn't seem to be much different from the "Opemus 5" model (the upper lamphouse just is a different shape), and the manual for this slightly younger model can be downloaded for free from
http://www.jollinger.com/photo/cam-coll/manuals/enlargers/misc/Opemus_5-En2.pdf .
The manual will answer your question about flipping the lens board for different focal lengths (on page 6-7), but apparently you already have figured that out.
The early Meopta lenses had a native thread of 23.5mm, not 25mm, so third party lenses will not readily fit. One solution is to make new lens boards from heavy duty PC board for your other lenses.
If free from dust and old-age milkiness, the Meopta lenses are quite satisfactory, but if you go for really large prints, a higher-class lens is advisable.
Have you noticed the semi-automatic rangefinder system? Pulling the negative carrier part way out, two lines are projected on the easel. Line up these two lines by rotating the bellows control knob and the negative is properly focused. It really works!

I wish you the best of luck with the enlarger.

Dear Michael. Iam new in here, on this site, but what lens do you recomend for the Opemus, brands, if you may recomend.

 

[BSP]

Hi there,

I too have an Opemus enlarger (a IV) and I use Schneider-Kreuznach lenses (50 and 80mm) with good results.