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Old 06-02-2008, 02:19 PM
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MrB (Simon)
Old Man Yells at Cloud

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Join Date: Jan 2007
Location: Rockingham WA
Posts: 3,435
It is a big claim.
I could have the wrong logic here (and the wrong numbers!) but I've read that standard ali coating is about 88% reflective.
a 14" mirror with 88% reflective coating is on a par with a mirror of 13.13" with an impossible 100% reflective coating!
So.. the 12" would need 120% reflective coating!!

Factoring in the secondary aswell, 0.88x0.88 = 77.44% reflective
A system with 100% reflective primary and secondary still needs 12.32" to match a 14" with standard coatings.

Did I get something wrong here?
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