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Re: [ATM] Pitch Substitute for very fast mirrors

PLEASE...
  Tell us how all the previous FAST and large mirrors that were made on a pitch lap these last 150 years were able to be made. Obviously it's an accidental process that some folks have been able to exploit to some extent...

Kevin MIchael Zabbo <chaosopher23@yahoo.com> wrote:
    Pitch does have a lot of useful characteristics that I
won't get into here, but it has a flaw that I need to
point out.

Fast and large mirrors, say 13" f/3, have a deviation
from sphere that can be measured on a decent
micrometer, which is far too big a gap for pitch to
conform. The pitch, even if soft, takes a long time
to flow.


   

 
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