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Yeah, noise is a big issue with the 550Ds. (I have one) They work best once the temperature drops below 10C and when it get close to 0C it's in it's element. The images it produces during Winter are stunning.
I have a modded 20D that I can use during the warmer months so I'm covered all year round.
DSLR's seem to be make for the ED80 refractor.
The scope has a wonderful FOV and most of the big bright DSO's frame up beautifully in it.
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