Yeah……I think I remember reading about the earlier invention. It sounds like multi-coating became economically feasible after with the joint venture of Asahi and Zeiss in the early 70s. Koichi Yasutani - a.k.a. Steve + MP Lakewood, WA U.S.A. 2010 / 11 / 21 00:15 PST On Nov 20, 2010, at 2241 , Eric Welch wrote: > Actually, multicoating was invented in 1938 at GE, but not widely used until > the 70s. But was it Pentax? Or Zeiss? Or both? > > http://gabriel.mp3-tech.org/blog/index.php?entry=entry090203-153355 > > On Nov 20, 2010, at 6:33 PM, Koichi Mac wrote: > >> Huh! That information is from the very company that invented multi-coating >> in 1970. Am sure they saw other vendors catching up and forgot to fine-tune >> the finesse part of multi-coating afterwards. :-D