There are at least two key "sources" for something like multicoating. You need to have an idea what magic elixir(s) will pass light without reflection, discoloration, etc. Then you need to have a practical manufacturing process to reliably and accurately deposit multiple coats of the elixir(s) on curved glass. Probably a bit of trial-and-error to resolve trade-offs as both what-to-put-on and how-to-put-it-on are addressed. My speculation is that Pentax developed the formulae for the coatings, possibly with help from OCLI. They then worked with Zeiss to develop the process for applying said coatings to camera lenses. The roles I suggest for some of the players may be off, but I suspect that no one small group developed the MC technology.
stan On Dec 21, 2012, at 1:27 PM, J.C. O'Connell wrote: > http://www.efiber.net/Company_Listings/O/OCLI/_ocli.htm > > ----------------- > J.C.O'Connell > [email protected] > ----------------- > > -----Original Message----- > From: PDML [mailto:[email protected]] On Behalf Of J.C. O'Connell > Sent: Friday, December 21, 2012 1:25 PM > To: 'Pentax-Discuss Mail List' > Subject: RE: didnt pentax invent multicoating in '71? > > What I recall is a small company called OCLI which was working for nasa > developed the process for the 7 layer coatings and sold the rights to > pentax which then held the patent so no one else could make them. Pentax > then released the worlds first super multi coated consumer photographic > lenses in '71. > > ----------------- > J.C.O'Connell > [email protected] > ----------------- > > -----Original Message----- > From: PDML [mailto:[email protected]] On Behalf Of Godfrey DiGiorgi > Sent: Friday, December 21, 2012 1:19 PM > To: Pentax-Discuss Mail List > Subject: Re: didnt pentax invent multicoating in '71? > > As I remember an article by Norman Goldberg talking about this > (published circa 1979 or so in Modern Photography): > > The multlayer anti-reflective coating technology was also developed at > Zeiss labs in the late 1960s-early 1970s, but Zeiss and Pentax were > collaborating on lens design technology at the time in a friendly > coopetition so the technology was shared between them. I believe Zeiss > holds the basic patents. Zeiss announced and released the T* coatings > on their product at just about the exact same time that Pentax > announced and released the SMC lenses, they use same coating > technologies with different branding and slightly differing > manufacturing processes tailored to the individual manufacturer's > needs. > > All the other lens manufacturers licensed the technology from Zeiss > and developed their own multicoating techniques based on it too. > Rollei called theirs HFT (it was almost exactly Zeiss T* because most > of their lenses were manufactured by Zeiss, but using their own > branding was less expensive...). Nikon, Canon, Olympus, Minolta, etc, > never made a big deal of branding their lens coating technologies the > way Pentax and Zeiss did, but post 1972-1973 nearly all the higher-end > lenses from every manufacturer had the more expensive multicoatings > applied to them. It was necessary to stay competitive. > > Assuming my memory isn't a fantastical hallucination, that's about the > story. ;-) > > G > > On Fri, Dec 21, 2012 at 10:02 AM, Matthew Hunt <[email protected]> wrote: >> On Fri, Dec 21, 2012 at 1:00 PM, Boris Liberman <[email protected]> wrote: >> >>> Quoting this article: >>> >>> http://en.wikipedia.org/wiki/Anti-reflective_coating >>> >>> -- start quote >>> Interference-based coatings were invented in November 1935 by Alexander >>> Smakula, who was working for the Carl Zeiss optics company. > Anti-reflection >>> coatings were a German military secret until the early stages of World > War >>> II.[1] Katharine Burr Blodgett and Irving Langmuir developed organic >>> anti-reflection coatings in the late 1930s.[citat >>> -- end quote >> >> Those are presumably single-layer coatings. JC is asking about > multicoating. >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > > -- > Godfrey > godfreydigiorgi.posterous.com > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
