Quote:
Originally Posted by h0ughy
not being funny but is your autoguiding keeping the image centered, its like the autoguiding is moving it around, making each individual image ok but when stacked any pixels that are singular and dont line up will show the tracking error. the drift may be on the mount and the autoguiding compensates - maybe?
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Autoguiding seems fine - the artefact has only appeared with the 400mm lens not the 70-200. The error you suggest shouldn't be stack/combine dependant though should it?
Doug