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I don't doubt that the D200 is a very fine camera, but for astrophotography (deep sky) I am skeptical it will not perform as well as the larger pixel cameras like the 30D/350D or the D50/D70. This is unless there has been a dramatic improvement in Quantum efficiency over previous cameras (Its hard to tell this in normal reviews as they concentrate on shadow noise, which actually doesn't tell you the full story off how the camera performs for astrophotography). Anyway, we shall see.
Gama, I have the 300D (modified) and 350D (standard) and I find the 350D has very low noise levels and is sensitive. As a test I mounted the 350D on a tripod, with a 50mm FL lens set at f2.8 and aimed around Crux I could see stars down to mag 11.0 in just 10 seconds of exposure! A 3 minute exposure with a 100mm f2.8 lens shows stars easily to mag 14.0 - without any dark subtraction.
Terry
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