Hi Graham - good to see you getting out there and amongst it.
Looking at your shots they tend to strike me as too noisy for the number of subs you have....how hard are you pushing the data when you process the stacked image? What ISO is the camera set to? Can you get any indication of the sensor temperature from the EXIF data - if you use APT this has the facility to add it to the filename.
Cheers,
Adam
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