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.
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