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Carl,
I use the 1000D with no filter for spectroscopy and it definately gives the extended spectrum.
A UV-IR filter (Baader type) has cut off at 400nm and 700nm so the Ha band is available at higher efficiency.
If the question is: Is the efficiency at Ha different between a UV-IR filtered camera and one with only a clear (or no) filter?...then the answer is it's almost the same....it's only when you compare with the original Canon filter that you see the difference.
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