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Its a good idea if folk always post image scale - arc seconds per pixel. I might guide at +/- 2 pixels, but if each pixel is natively 0.44 arc seconds (then I bin 2*2) - and seeing is really below 3 arc seconds a pixel - I won't see any discernible drift or badness in a 30 minute sub typically as I am oscillating back and forth maybe an arc second - which can just be variances in the seeing for my night skies.
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