Yeah you got it, ideally in planetary you want to set your gain/frame rate to maximise the bit range you’ve got, typically only 8-bit, although this precision is promoted by stacking a large number of frames. About 3/4 full on the histogram usually gives enough headroom for highlights.
I’ve thought about trying my 178 on the bright planets because of its higher potential dynamic range, but it’s compromised by lower frame rates...the 290/224 are just faster.
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