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Gordon Rayner
Pooh-Bah
Reged: 03/24/07
Posts: 1083
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Re: Celestron Regal 8x42 and 10x42 Roof
01/12/08 02:09 PM
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What about "phase coating"? Are these low price roof prism faces just metallized? Or, are they using multi-layer dielectric coatings, to keep overall transmission high? I think that there are some simple tests using polarizing sunglasses, or crossed pairs of them, but have not done any of this testing in this context. Does anybody have a working, calibrated photometer to lend to some tireless reviewer(s)? What is the phase problem/problem solution story on the erecting systems such as in the Baywatch telescopes and the various 45 deg Schmidt prism erectors for other telescopes?
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