Quote:
Originally Posted by furgle
I've been using Astronomik Type 2c RGB filters for a couple of years and just recently switched to the new Deep Sky RGB filters.
I'm getting these very strange flats where they all have a bright spot in the middle, instead of a steady gradient. It's evident in my light exposures as well (as a dark area). When I apply the flats to the light frames, the darkness isn't fully flattened out though, so I'm getting very frustrated.
Am I doing something wrong here? Has anyone encountered this before?
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Don't do much imaging myself..but heard these can be caused by ghosting from the big lens of a not so perfectly spaced reducer /corrector.
bigjoe