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Hi guys, this is my effort on the Iris Nebula with a Tak FS-128 from a dark sky site in Ireland. I was being greedy, doing multiple targets on the same night (March 17th) so I only captured 2 hours on this one. Takahashi FS-128 with 0.75X reducer/flattener on Vixen AXD2 mount 60 X 120s with Nikon D750 Processing in PixInsight and Photoshop There's something funny going on with the rings in the background, which I have not been able to get rid of. This was from a truly dark site (Bortle 2) and the subs don't show any sign of these rigns, just the usual vignetting. I think the calibration is actually introducing the effect. I took flats and all that jazz, and did all the calibration in PI so I don't know what I'm doing wrong. Has anyone seen this kind of thing before? Comments and suggestions welcome! Barry