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Hi Lester,
It really just comes down to your total exposure as to how faint you can image. Apart from that the only improvement might be lower temperature and better transparency.
Anyway, looks like I was able to get an image of the new Sungrazer comet (C/2012 E2) that appeared a few days ago. This was made very deep in twilight on March 10, using a Canon 350D + 70-200 2.8 lens set to 135mm f3.5 and combining 72 x 3.2sec ISO400 exposures. Possibly the must difficult comet observation I've ever attempted.
Terry
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