On the 600D you need to set the exposure time to be much shorter.
From memory, if the camera is on manual, turn the dial that is near the shutter button (I think clockwise) until the image gets darker.
You'll want your ISO to be pretty low, it will depend on your scope. On my f7.5 ED80 I use around ISO400 but if you have a newt or something with a smaller focal ratio then you might go even lower.
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