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Re: [ATM] The 15.5 Ultrathin Project, Astigmatism discussion

To: Mike Lockwood <melockwo@uiuc.edu>
Subject: Re: [ATM] The 15.5 Ultrathin Project, Astigmatism discussion
From: Daniel Fundo <fundo@bellsouth.net>
Date: Fri, 20 Jan 2006 14:03:35 -0600
Cc: atm@atmlist.net
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<<  A very good flat would work, but its diameter would probably need to 
be a significant percentage of the diameter of the mirror, depending 
on how far from the primary mirror it is placed.  A household mirror 
would generally not be of the quality required for testing.  >>

In addition, a common mirror is second surface, which could give you
errors from both the actual mirrored surface, the front surface of the
glass, plus inconsistancies in the thickness of the glass.

*****-----
Dan F.
Former Secretary/MAS
Memphis, TN
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ATM mailing list http://www.atmlist.net/

References:
- [ATM] The 15.5 Ultrathin Project, Astigmatism discussion
  - From: vorblesnak@peak.org
- Re: [ATM] The 15.5 Ultrathin Project, Astigmatism discussion
  - From: Mike Lockwood <melockwo@uiuc.edu>

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