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Also 2x2 binning efficiency varies with sensors. The KAF8300 for example has a flaw in that it can't bin 2x2 properly resulting in a much lower advantage in SNR than it should and is more like 2X increase rather than a 4 times increase. The KAF16803 though is close to perfect and does bin well with a large gain.
What I have noticed though is 2x2 loses rez even with only colour and if you can afford the time investment 1x1 is better. Another advantage of a fast scope is the ability to afford 1x1 binning on colour as well as luminance without the time hit resulting in a more vibrant and detailed image.
Greg.
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