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Thanks Ryan. With the M16 image I used Noel Carboni's astronomy tools actions for photoshop. It's a plugin that has a few processing routines. Star spikes is one of them. I don't use that routine often but I did with that image.
F10 is slow going, hence the need for long total integration times. I think for most objects 10+ hours at least. I've discovered 2000mm (8") F10 shows more structure in objects than my 1000mm (10") F4 Newtonian. I originally got the 8" F10 SCT for planets but find myself preferring it for bright DSO's.
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