Nice image, I think theeres a hint of field rotation in lower right, though that can be fixed by rotating the images as thet are aligned. Iris has a function where it picks 3 spots around the edges of the image to align, I know IP can do it and theres probably a function for that in CCD soft though Im not familiar with that software.
Id like to see what that rig can do on emission nebulae and planetary nebulas.
Scott
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