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If you bin the pixels in the D200 you will increase noise as square of the binning since you can only do this in software. i.e bin 2x2 the noise will be 4x as much, and you will have only 4x as much signal. You will not gain anything. In an monochrome astrocam if you bin in hardware, you increase noise less than 4x since you are reading out all 4 pixels at once.
Anyway, I have asked somebody who owns both a D200 and 350D/XT to do some side-by-side and he has agreed. So I'll report back.
Terry
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