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I have the 20D but....
ISO 800, Manual mode, NR off (use darks), Mirror lock off (only use it for moon shots), RAW exposure 30s to start on a bright DSO - up to 3-4 mins is my limit so far but I would like to go deeper...
If using piggyback with my lenses I close down two stops to reduce CA and spherical aberation - but then my lenses are the consumer grade.
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