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I have the ASI183mm Pro and its a new camera for me.
AMP glow so far has been no problem as it dark subtracts out very easily.
The 1600 has around 60% QE (Quantum efficiency is what percentage of photons are registered on the sensor and form an electron).
The 183 is 84%. That's very sensitive. For my use the smaller field of view is a good thing but for yours perhaps the wider field of view may be a big deal.
The 1600's FOV is only a little bit wider - like 20% or so.
I don't think there is a wrong decision here. There are lots of 1600's that go 2nd hand as well, not so many 183's.
Greg.
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