Novice imager here with all the gear and no idea. 😉
I have an Atik 383L mono, and an EFW2 with 7 x 36mm filters from Baader. LRGB and NB. Guided by a QHY5II on a 50mm guidescope.
With my first ever session with the mono Atik, after stacking my lights and combinng the RGB images together (Deep Sky Stacker) using a reference image for all the stacking, when I combined them in Gimp, I noticed that while the stars were all perfectly aligned, that my hot pixels (I didn't do darks or flats, I was just testing) were all in a line, in order.
I suspect this is flexure between the imaging scope and the guidescope, but I'm not sure. Anyone have any input?
Thanks all.