Quote:
Originally Posted by JethroB76
I thought this scope already had nice locally made 12.5" mirror in it?
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it did, but after a year and a half of use under all manner of seeing conditions, I've found that there was some mild astigmatism somewhere in the optical train. Compared to my 8", contrast appeared to be a little less and stellar images were noticably "less clean" at high power. The primary was tested, and IIRC it had a couple of zones, which threw some of the light out of the airy disk. I can't remember if the primary was causing the stig though... could've been the secondary. So with that, I decided to go ahead and replace both mirrors, which will eliminate all doubt.
Quote:
Originally Posted by erick
Congrats Sab! I'm sure it will be superb!
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THanks Eric! Peter's evaluation of the mirror -
sensibly perfect 