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


If all of the stars without the corrector end up showing a comatic tail,
then you are not properly collimated.  The tail of the comatic image is
pointing directly AWAY from the center of the primary's optical axis which
is what you are wanting to have as the location for the center of the EP or
camera.
Remember that the secondary's purpose is just to bend the light going to
the EP from the primary.  It does no real optical purpose other than that
and it should do no function to modify the actual focusing of the light.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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