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All my imaging up till now has been done with an unmodded 400D (check my posts). I have recently got my hands on a modded 30D. Even with very early testing, while the 400d looks to have less "thermal" noise (taken care of using dark files), the 30d has less high ISO noise. The removal of the Ha blocking filter makes a hhhhuuuggggeeee difference! For example, see the attached picture of Eta Carinae. It's only a combination of 10x1min subs. So much detail that I could not get with my 400D.
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