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Thanks for all the input Guys
Scope and camera are set up to six minute subs at ISO 800 for the next two hours. Ten minute exposures and it was almost polar bear in a snowstorm material with the histogram about 3/4 of the way out to the right. The settings I've settled on have the histogram about halfway. None of the other ISO settings (640-400) seemed much better, they were 'darker' but even with longer exposures didn't appear to enough data.
Anyway, if anyone is interested let me know and I'll post the final results.
Paul
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