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Thanks again,
Garrillaga that 20inch mirror from OO sound wonderful, they make mirrors to 1/10 wavefront measured at 632.8nm (measured with Zygo interf equipment), but a 20inch may be too difficult to make to that standard so even if it is 1/6 wvfrt it will still perform brilliantly.
OO will make mirrors to any standard it just might cost too much to be worthwhile and at 20inches improvement may not be noticable. They give a interferemeter report with the mirror and Hilux coating is 97% at 550nm and 95% at 656nm and will really lift a 20inch Newt's power.
You can email John and Barry at OO as they usually answer all there emails.
Regards, John.
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