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
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