Rodenstock Omegaron cleaning trouble

JJB · Jul 11, 2010

I need to disassemble a Rodenstock Omegaron 75mm enlarger lens for cleaning. I was able to get the first ring off of the front, the one with the name on it, but the ring behind it seems to be frozen. Any suggestions?

Also, I am unable to find a way to unscrew the back ring as it has no grooves to use a tool on. The ring is smooth.

Help!

Thanks!

JJ

ic-racer · Jul 12, 2010

I have used heat to free up lens rings. How hot? Well, hot enough to get some expansion. The last few I heated up with a hair-blow dryer on high. Some lens rings I have encountered are sealed with two drops of something soluble in acetone. (The black edge on some lens elements I have found to also be soluble in acetone also, to be warned.)

Jim Noel · Jul 12, 2010

Omegaron lenses are dirt cheap. Why bother with this one?

ic-racer · Jul 12, 2010

Jim Noel said:
Omegaron lenses are dirt cheap. Why bother with this one?

Seems like it would be a good one to practice on.

vedmak · Jul 15, 2010

on a the ring without notches try a rubber brick, on the front try custom cut spanner.

guitstik · Jul 16, 2010

Big hammer

Rick A · Jul 16, 2010

I prefer to use a "hot wrench"(blow torch) and BFH on them.

JJB · Aug 4, 2010

Problem solved! I used my Dremel tool to cut the missing notches. I covered the entire thing in masking tape first to protect it from the dust that is produced from a grinding wheel. Worked like a charm!

As for the front ring, it just took a long time and a lot of attempts to unscrew it. Push on notch, spin it, push on the notch, spin it, rinse and repeat.

outwest · Aug 4, 2010

FWIW, at one time I thought my 75 Omegaron was pretty good - until I tested it against an 80 EL-Nikor and a Componon-S.

Rodenstock Omegaron cleaning trouble

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