Quote:
Originally Posted by DarkArts
Are your filters truly parfocal (some aren't), or are you refocussing for each filter?
I've read that longer wavelengths are less susceptible to poor seeing, so it could be that.
The brightness difference could be your camera, the filters, the target, or all three.
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Was imaging the horsehead nebula. They are Baader L-RGB filters and I re-focus each filter change.