Rodenstock Omegaron cleaning trouble

[JJB]

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]

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]

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

 

[ic-racer]

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

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

 

[vedmak]

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

 

[guitstik]

Big hammer

 

[Rick A]

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

 

[JJB]

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]

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.