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Join date: April 2014
Status: Long, long time Contax and Yashica user; glad to be here and hope to contribute.
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on Aug 1, 2016 22:38:13 GMT
Posted: Aug 1, 2016 22:38:13 GMT
Hi everyone,
I wonder if anyone here can state how many layers of costing Yashica employed in the ML process and also the provenance of that statement?
I have heard mention of both 5 and 6 layers but have failed to find any document that provides the answer. When you read the Carl Zeiss explanation of their coating, it's reputation for quality comes as little surprise:
'Zeiss T* anti-reflection coatings comprise 7 layers, each layer being dedicated to a particular frequency of light. Each layer has a thickness that is ¼ of the wavelength of the frequency of light to which it is dedicated. Light is phase shifted ¼ wavelength as it passes through the coating the first time; if the photon is reflected, it passes through the anti-reflection coating again and is again phase-shifted ¼ wavelength. The photon is now 180 degrees out of phase and so is annihilated.'
Pretty clever…
I found the Zeiss reference in one of my brochures for the TVS Digital camera. I've looked through all my Yashica lens and camera brochures but still can't find as detailed a description of the ML coatings. Perhaps the only solution would be to find the patent though that is a task beyond me.
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on Aug 2, 2016 2:08:30 GMT
Posted: Aug 2, 2016 2:08:30 GMT
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Group: Moderator
Post: 2,033 (561 liked)
Join date: April 2014
Status: Long, long time Contax and Yashica user; glad to be here and hope to contribute.
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on Aug 2, 2016 3:30:30 GMT
Posted: Aug 2, 2016 3:30:30 GMT
Thank you very much for trying.
Unfortunately, the links you kindly provided have expired so I'll need to start from scratch. I would think Yashica registered them internationally so I might as well see what, if anything, pops up through the UK Patent Office records; if all else fails, I'll wind up my translation software and see what happens with a Japanese search - should be a giggle, given the limitations of the software...
I still have a few dozen boxes to open following my move of house 3 months ago and in one or more of them is most of my literature on Contax & Yashica; it may be that the earliest brochure featuring the new ML lens range might just have something more detailed on the coatings than I remember. I found a lens brochure from 1979 produced for the Australian market that contained more info than most others - it must be in one of those boxes so I might get lucky...
Nil desperandum!
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on Aug 3, 2016 2:33:59 GMT
Posted: Aug 3, 2016 2:33:59 GMT
Like I said. Just. Typical.
The first link was the old "Wild West" Yashica trademark which has been abandoned, and the second link was the last version before they disappeared from the market, and is still live.
There was a link on the USPO site that took me to an English version of the Japanese patent office, but it wasn't much better to navigate.
PF
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on Aug 10, 2016 15:29:59 GMT
Posted: Aug 10, 2016 15:29:59 GMT
Not to say it's unimportant, but into the End, what really gives if ML Coatings means 5, 6, 8 or (virtually) 10 layers? The ML coating is slightly inferior to Carl Zeiss T* (T-Star) Coatings...but i am way happy to have my current ML Yashica Collection. :-)
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on Nov 5, 2016 21:57:27 GMT
Posted: Nov 5, 2016 21:57:27 GMT
Just a thought but since many of the Contax/Zeiss T* lenses were made in Japan by Tomioka/Yashica they would have known all about the multi-coating process and may have used it/adapted it in one way or another.
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