The run of inclement weather in Sydney has made it difficult for me to explore the QHY600M's capabilities further, but I am coming to the conclusion the intrinsic noise of its CMOS sensor is about an order of magnitude higher than my KAF16803.
Read noise looks to be a red herring. It is simply the consistency of the signal your read-up, and says nothing about the pixel to pixel variations.
Problem is CMOS have outliers that while consistent in value, are spread over a much wider bell curve....
I've put some
more test data here.
Don't get me wrong...I like this camera a lot. The resolution is awesome.
But for ultra dim targets from my urban sky....humm...no revelation so far.