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[ATM] View's through my new scope and what to do next

Hello

Does anyone know how to correct for coma in a primary mirror say like in a 20" diameter, 1" thick plate glass, 8 foot focal length mirror?  The images I'm seeing with my telescope set up with the uncoated primary mirror so far are this:  The green in the leaves of the tree in the distant tree instead of looking green, look a grey color.  And they lack contrast.  Is this a problem with the shape of the mirror, or should I go ahead and get it aluminum coated at http://home.covad.net/~alcoat/   where they could coat it for about $100.  

Here is a way to get to the place to see a picture taken through my telescope.
Click here:   http://www.atmlist.net/contrib/dwilliams1128-at-earthlink-dot-net/

then  click  on                 20" telescope stuff   
then click on                  ViewThourghMy20Inch  #'s 1 and 2

Thank you
David
Bye


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