From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


Before you ship that mirror off to the coater, please put it into the
telescpe and test it on the stars.  The Double-Double is one nice test - a
6" uncoated mirror can split the 4 stars very nicely so any bigger
mirror shouldn't have a problem there either.  Nearby Vega will be an
excellent target for looking at the Airy disk as well as the third star in
that triangle.  Faint objects won't be visible as you are only getting 4%
of the light rather than 90% of the light to the EP but bright stars will
do very nicely for testing the quailty of the surface. There's nothing like
finding out after you have spent all that money for the aluminizing that
you have the wrong shape on the surface. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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