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The offendor
May be this should be moved to the beginners section. May as well finalise this for info.
Anyway. The offending images were throughout the 10 and 15 second sets.
Basically, during the image run on the first night I tried different f/stops, down to 6.3 the difference in SNR was significant as should be expected, but I didn't anticipate the problems assw processing.
I have settled on f/5.6 as a good setting, although 6.3 and longer exposure time gives nice sharp stars - even at 5.6 a little bloating begins to show after 30 seconds.
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