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I while back I asked somebody who own's both the 350D and D200 to run a couple of side by side tests for me. With both cameras mounted on a tripod and aimed at the south celestial pole I got him to make a series of exposures at various settings. The attached comparision image are crops made near the celestial pole, using a Tamron 18-200 lens at 18mm f5.6 with 30 seconds exposure. It is possible the D80 is improved over the D200 but I haven't seen any comparisions for astrophotography yet. According to Christian Buil the 400D has higher Quantum efficiency, but smaller pixels and slightly higher dark noise mean there has been no net improvement.
Terry
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