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Brett,
I have no idea what the SGP settings mean so I can't recommend anything there.
You'll see the effect of the dithering in PI as the results from StarAlignment are displayed in the process console. It prints the delta X and delta Y (and rotation angle) required to register each sub to the reference image. So long as I'm seeing a decent amount of variation there and numbers that are usually at least a couple of pixels I know the results will be fine.
Cheers,
Rick.
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