My first image was "align on stars and comet". I get the mottle background and black holes in the brighter stars.
My second image was "align on stars". That seems to work well, except the comet is trailed.
To get around this, for my final image here I took the comet from the first image and overlayed it in GIMP with the the background of the second image. But it would be nice if DSS could just do what it's meant to.
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