Mike - I like your Eta reprocess! there seems to be a slight gradient from left to right that goes about 1/8th of frame... Have you attempted to remove that with Gradient eXterminator?
Other than that its a ripper image... The other dudes one of the bubble is sensational also.. but you are correct, there seems to be a slight collimation issue present..
(sorry to go off topic in your thread Robin.)
Back on topic, the last of the 3 images you posted earlier (M20) is a real ripper mate! the blue reflection neb is showing through nicely and there is great detail in the red section at the front.
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