Re: [ATM] Astigmatism on thin blanks

["Peter" <peter@kitgear.com>]

Great... Keep the knowledge flowing and let's publish a good how-to method
for thin mirrors.

Here's a pic of my 25" x 1" thick mirror which has the mirror supported at
90 degrees like Mel just said.

25" Scope Picture:
http://www.kitgear.com/10001.JPG

Mirror cell:
http://www.kitgear.com/10002.JPG

Usable thin mirrors can be made.


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
Of bbastro1
Sent: Wednesday, May 21, 2008 8:57 PM
To: 'ATM list'
Subject: Re: [ATM] Astigmatism on thin blanks


>>>Test in a sling.

I've seen much less astigmatism using the two peg at 90 degrees edge
support.  The 90 degree separated supports cancel the main form of
astigmatism.

Mel Bartels


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