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I always image rgb with blue first and red last past the meridian. As you say red cuts through the thicker atmosphere better than blue and green. Blue also tends to be the most bloated even with decent seeing.
Sometimes its not convenient to wait for an object to be near the zenith given weather, moon and time constraints. Luminance is usually fine in a zone say arbitrarily about 30 degrees on either side of the meridian.
But yes, a good night of good seeing and the object near the meridian you are going to get your best data from luminance.
Greg.
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