Quote:
Originally Posted by Ian Robinson
I'd send the optics off to the USA to get a 98-99% reflectivity dialectic coating (that would be like adding a inch or two of glass (based on standard Si02 protected Aluminium mid 80s reflectivity).
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Quartz protected coatings if properly done with 1/4 wave protective layer do not cut reflectence of fresh aluminium, and come in at 89-90%. Typical dialectric coatings are TiO2 layers and are closer to 94-95%.