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Very nice Brett. There usually is an ISO sweetspot for most cameras. For example the Sony A7r2's is ISO640 due to the digital converter having some sort of step in it and the read noise drops there.
So ISO1600 may've been too strong for 5 minutes and you lose some colour. The Ha not showing is more likely a stronger IR block filter than other cameras. I was surprised my A7r2 picked up some Ha in that area and it must have a weak IR block filter. It has no anti aliasing filter and that may also have an affect.
Greg.
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