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There are hundreds of super images taken with 4 inch refractors. You don't have to know anything about the theory just look at the final results.
The multitude of images speaks for themselves.
An FSQ106 whilst not $2000, is in a league of its own and many would consider it the king of widefield imaging scopes.
If you want close up galaxy images though you can't get away from the need for largish aperture.
Greg.
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