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Trevor,
Actually I think your dead right with that view - I was just experimenting. I think if you are not dealing with a high dynamic range target (e.g M42 Orion) then fixed duration shots should simplify your processing.
So I am shooting the Helix at 30 minute subs. Must say the burn offs are annoyance - given how faint the target is. Why they couldn't do this during the full moon or whilst there was alot of cloud cover puzzles me. First dark nights, otherwise clear skies they have to schedule their flame on skills!
Just bad luck huh?
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