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Gama,
Nice result, actually its the first astrophoto I have seen done with the D200.
As you comment the IR filters really do a number on the H-Alpha response as well as any wavelength longer than about 550nm. Somewhere I read that D200 rendered skin tones very well in comparision with previous Nikons, so presumeably this is a result of the decreased IR response.
Would also be interesting to see a 1:1 crop near say the Lagoon nebula (in the non noisewared version).
A question what options do you have of activating the shutter in bulb mode with the D200 (i.e IR remoted, wired remote, etc).
Terry
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