Another approach is a hybrid luminance of both 1x1 and 2x2 using the 2x2 to bring more depth and the 1x1 for more sharpness and detail.
Unfiltered luminance will give you bloated stars. Not real bad but noticeable. I have a clear filter which has no UV/IR coating like luminance normally does and that's what it does. I think you do gain a bit more sensitivity from using it but not that great.
Greg.
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