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Hi Chrys.
The lighter and darker exposures are fine to go together in the stack, provided the lighter ones still have a decent S/N ratio... different brightness values will be delt with during normalisation when stacking.
It's quite normal for some filters to be brighter than others, obviously Lum will be the brightest. This can be due to your cameras response to different wavelengths. This to will be sorted out with you RGB combine ratios.
Josh
Last edited by Joshua Bunn; 16-09-2020 at 11:46 PM.
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