Re: ATM How to Grind Identical Mirrors?

["Bob May" <bobmay@nethere.com>]

Considering what I've seen for focal length changes just in figuring, that's
a pair of mirrors that are essentially identical.  One went short and the
other went long, mostly because you didn't alternate the early polishing
with both mirrors.  I might note that is only a 1.3% difference between the
two mirrors.
As to the mirrors, I have no doubt that they will outperform my 200"
refractor for any work you do.  I do suggest that for lower power views that
you consider making up some long Ramsdens or Kellners in a 3" or even a 4"
diameter size.  You won't believe the eye relief that you will get with a 4"
focal length EP of even a simple design.
Bob May
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Bob May