Robin I am starting to think that as well, and I do have Deep Sky Stacker, things seem to be the same as with the others.
I don't think it is Camera or capture related, and the software seems to be doing what it is supposed to as well, so eliminating these things all that is left it maybe the screen displays.
I know mine is pretty bright, I do that on purpose, and if i drop the brightness the rings tend to deminish quite a bit.
It dose not seem to effect the final light image though.
glade you have seen some rings as well Robin, I thought it was just me giong mad.
leon
