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ATM Colimnating a Newtonian with a perforated mirror?

To: atm@shore.net
Subject: ATM Colimnating a Newtonian with a perforated mirror?
From: Nick Martin <bonnyton@ednet.co.uk>
Date: Wed, 23 Jun 1999 00:16:20 +0100
Reply-To: Nick Martin <bonnyton@ednet.co.uk>
Sender: owner-atm@shore.net


Dear list,
The astronomical society to which I belong has been given access to a very
nice 12" Newtonian. The only problem is that the mirror is perforated,
presumably for use as a Cassegrain or similar. It is optically good but the
problem is how to colimnate it, other than doing a star test. A centre spot
is clearly impossible.
Nick
Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK.
 Latitude 55 24'56" Longtitude 4 26' 00".
"Eppur si muove" Galileo Galilei

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