Re: [ATM] New 16" ultralight telescope

[Ken Hunter <atm_ken_hunter@yahoo.com>]

Tony,
   
  I was more interested in obvious defects in figure caused by non-homogenities
  or stresses in the glass. I have some polaroid filters available for testing but the
  local glass company does not stock the glass. They want me to order a min 
  of 2x2 feet for them to go through the trouble of obtaining the glass and are really 
  not interested in taking it back if it's not suitable. So... for $60.00 I can order a
  piece or ask if someone else has done the testing... I wanted it for a 20 inch 
  window that I plan on figuring myself anyway so flatness isn't the main issue.
   
  Ken Hunter

tony gondola <acgna@comcast.net> wrote:
  Starfire is an German art glass that's prized for it clarity and slight blue 
tint. It's used to make crystal ornaments, trophies, ect. I can't imagine 
that there's any reason to think that a slab of this stuff would be any 
better then hit or miss in terms of optical flatness.

Tony



		
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