[rollei_list] Re: AW: Re: Color Ultron AR 1.4/55 Made in Germany?



On May 04, 2012, at 04:15 AM, Marc James Small <marcsmall@xxxxxxxxxxx> wrote:

At 02:58 AM 5/4/2012, Dirk-Roger Schmitt wrote:

>2) Considering the multicoatings: MC, HFT, Zeiss
>T*..... All these are only trademarks and do not
>say anything about the type of coating or the
>quality. The multicoatings are all quite
>similiar. The difference is just the color of
>the remaining rest reflectance. This might be
>green, red, or red/blue. The color of rest
>reflectance has been selected only for marketing
>reasons, not for technical reasons. So Zeiss
>wants this dark/red colour as a "branding". Even
>at that time, the coating designs have not more
>been developed by the optics manufacturers but
>just bought together with the coating machines
>from the coating machine industry like Balzers of
>Leybold. So you buy a machine for multicoating,
>and the supplier asks you: What colour of rest
>reflectance you prefer? Then you get the process with the machine.

I don't believe this to be correct. The color of
a lens coatings indicates the frequencies which
it most effectively serves. Zeiss is most
insistent on this and there have been a few
articles on this in ZEISS LENS NEWS. If there is
a difference in the indicated color of the
coating, then that shows that the peak
effectiveness of the lens coating will also be different.

Marc


msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
 
I'll line up with Marc on this.
There is a good Guide to this stuff here:
https://www.cvimellesgriot.com/products/Documents/TechnicalGuide/Optical-Coatings.pdf


From a fairly High end Scientific optics company, Melles Griot. I found their Guides very readable when I was doing optical instrumentation research.
All the best
(Dr) Laurence Cuffe 



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