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Thanks Rowland, they are good questions.
Intuitively I would have said that the sky noise (such as from light pollution) is fixed for a given location, and so signal and sky noise will be captured together regardless of the sensor gain. Dynamic range will obviously be reduced as you increase gain (ISO), but I would have thought that provided the sensor is not being clipped at the sub time chosen you could use a higher ISO (such as ISO1600 as suggested by my plots)...?
Your thoughts?
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