I think I read the coating reference on the Schneider website, maybe in Wikipedia (but then I get a second source). Maybe I did confuse single sputtered coating and multi-coatings. The words are similar. I though it had to do with the size of the chamber used for coating. Certainly multi-coatings were occurring on small format lens even before the war in German lens-makers manufacturers. But it became restricted information, as war related secrets.

Being able to make superior reconnaissance photos was a big war secret.

And the size of the plasma chamber was the limiting fact well late 1950s and 1960s, I was told by a technologist.

This is what I've read.

BTW, if you can poke some other holes in my BHoIT, <http://www.vitaleartconservation.com/BHoIT.pdf>, I'm doing a re-write soon and very few folks have the knowledge to help.

Please try to limit it to items you have proof for, because I'll have to do the research.

ThX

Tim
tjvitale <at> ix <.> netcom <.> com --- for email address remove spaces and carets
510-594-8277