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Nice image and nice to see an image from the TSA120.
Galaxy imaging is a bit of a stretch for any refractor really unless 7 or 10 inches in aperture. Event then mirrored scopes do a better job usually.
Focus may be a tad off and its hard to nail it exactly without an electronic focuser although it usually just means a bit more work with the microfocuser and trial and error.
A great cheapish electronic focuser is the Robofocus.
Greg.
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