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Tim, Allan, Steve, M&T
Thanks to all for the comments.
Allan, my standard sub exposure time is 5min R,G,B; 2 - 5min L; 10-15min NB.
M&T, thanks for your suggestions. In this instance, as I had not educated myself about the strong RBI characteristics of the KAF9000 sensor, I unfortunately ran one set of data immediately after shooting a fairly bright asterism. So the background blacks have been clipped to remove the offending smudges, but not in the galaxy area. That was my preferred solution, rather than lose a lot of good data on the galaxy.
I think the only solution for getting better detail on those faint arms is more data.....
Now I am aware of the perils of ignoring RBI on this sensor - much to do with the 12micron pixels - I hope I can avoid the problem in future.
Thanks,
Mark
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