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I'll usually take a 30 second high ISO shot for composition, and reposition the scope until it looks right. With some objects like M42 you can get away with less, but it is rare that you will see a galaxy or DSO through the camera on short exposures. Depending on where you are in Brisbane, you may or may not see the smudge of the galaxy visually through the scope. An MN56 is pushing it aperture wise for all but the brightest.
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