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The blue channel seems to be the one most affected by seeing and atmospheric dispertion.
Generally, I've found that if the blue channel is good, you'll get a great image. If the blue channel is really messy, the whole image will suffer as a result.
Why yours is better than Lesters and Dave's, I imagine it just comes down to the conditions on the night they were taken. You'd have to compare the blue channels from the same location in yours and Lesters scopes (on the same night) to see if there's anything else in it.
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