Hi Leon,
You already have a full frame sensor in the 5D and its modded. Being modded it would be better for astro photography than the 1D, unless you mod that as well and are you prepared to mod a 10,000 dollar camera?
The extra pixels wont be that much help, you already oversample with the 5D for your FL so you would just be oversampling more with the 1D.
If you have 10,000 to spend, go and buy an SBIG ST 11K.
Paul
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