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Pete...longer subs is the key. Try at least 5 mins so you'll be sky limited in noise, rather than camera limited.
I'm still blown away from the resolution you have achieved.....the double at 1:30 o'clock is rarely split in images with gear costing 10x as much. You've done really well there.
As for the noise....does the camera not self cool? If not, you may get a significant improvement via an ice pack or dry ice pack strapped to the camera.
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