Hi Brian,
I do acknowledge that French is somehow not easy to master (probably a clever manoeuver from my compatriots to remain mysterious and misunderstood

). But we should be all right.
I am not fluent in mandarin chinese, although I had to learn some cantonese when I was in Hong-Kong (but I forgot it all).
I don't have the lens around right now, but I think it is the single coated version. Nevertheless, I love the results I get with it.
The 75mm is also very good, and I find focusing easier than with the 90mm lenses I tried, Leitz or Voigtlander alike.
By the way, I have a question for those who have encountered the same problem. The vulcanite layer on my camera is starting to peel off. Not a big deal, but I would like to solve that when it is still on a very small surface.
Is there any kind of glue I should avoid ? I was thinking neoprene glue, but I am not to sure about it.
Thx.
Regards,
Raoul