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Hi Justin,
Looks good.
Did you try a shorter sub and higher ISO rather than a longer sub and lower ISO?
I'm guessing stacking 2 min subs at 800 ISO would provide good details as well and shouldn't look overexposed even with the moonlight.
would keep noise low as well. I'd say its worth a try to compare.
Did you find a reasonable amount of guide stars with the mini guider?
edit: my hunch is that with your dark skies and a the F4, the short sub will provide sufficient details at 400 or 800 since the object is bright.
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