Quote:
Originally Posted by Satchmo
From my experience of working with fused blanks and testing those made by others they don't take as good a figure as monolithic - My experience is they just don't behave as well as monolithic during cooling and under pressure of manufacture nor mounting induced stresses in the telescope. By that I mean in a 3 dimensional sense .
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Yes but if you look at Hubble Optics
http://www.hubbleoptics.com/mirrors.html
They say
Quote:
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40" sandwich mirror delivered to NASA in 2014
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If they can make a 40" mirror for Nasa then they must be able to make a 10" mirror for me.
Apparently sandwich mirrors can suffer from "print through".
I intend to find out for myself.
It could be that a new wave of telescopes will start off with sandwich mirrors.
I am trying to break new ground.
I will be able to compare the performance of a standard mirror & a Hubble Optics sandwich mirror & report back to everyone.
I won't get the sandwich mirror for between 4 to 6 months.
cheers
Allan