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Marc have you tried the Noise Compensation settings when you choose register? With dense star fields sometimes it helps to use a version that has had noise reduction only as a starting frame. Then align with the noisy version of itself
Always use the higher resolution image as the reference frame.
Registar is very good at aligning noise. In dense star fields the reference vector set can match up to just about anything.
When aligning HA with colour alot of stars are missing or faint in the HA version so strange local alignments leading to distortions occur. Aligning HA with just the red layer also really helps.
It again shows if you really want to stuff something up a computer will do it better.
It does look a bit like black hole distortions. Are you sure they havent come down the line from the LHC?
Bert
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