Thanks guys for this thread. I also have a 135mm uncoated Eurynar that I will test some day, and maybe have it coated if I like the results. The elements are easily disassembled - just screw the lens mounts apart and out comes the glass.

Ian, I see that the also do reflective coatings, so remember to use the word "ANTI-" when you write the note that you send them with the lens elements.