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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Hi Mark,
I am surprised by this comment, as I thought that you figured Anthony Wesley's fused 16" blank which seems to be producing some really fine images.
I had the pleasure of looking through a 16" mirror made by Hubble Optics a few weeks ago and must admit that the views were excellent and it looked like a very fine mirror - all depends I guess on the optician.
My dream telescope is a 20" Newtonian with a fused/composite mirror for rapid cool down assisted by a peltier cold plate to be used for planetary and deep sky imaging.
These one piece cellular blanks look interesting:
http://www.dreamcellularllc.com/40cm.htm