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Nice first image.
The 20D is a wonderful camera especially if modified (clear glass option gives the most options).
You could try using a minus violet filter with the 1200mm scope and the 20D to cut down on the halos.
10 seconds of course will limit what you can get.
Can you get 30 seconds with your mount? I think most can do 30 seconds without too much star elongation.
Also set it to ISO3200 (ISO expansion set to on first in the menus) if you didn't already - that helps when using very short exposures.
Greg.
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