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There does appear to be a small vertical component of about 2 pixels in the image. For a single shot 270 sec image I would say it was pretty dang good. It may be that the focal plane is not exactly parallel with the image plane, not sure. Multiple images stacked with shorter subs would possibly 'cure' it. But for a single frame I am quite impressed with colour and resolution and the guiding is pretty dang good IMHO. Any filters used for LP ?
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