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Thats a pretty cool result considering you are pushing the Ha wavelength through the camera's filter that is doing it's level best to reject that wavelength. Remove the filter in the camera and you will get more Ha data in 15 minutes of integration than you have managed with 60 minutes here.
I am going to modufy one of my canon bodies (1000D) in order to achieve better spectral performance in the Ha region. I already have a 300D that is modified, but it doesn't have live view and as such is a PITA to use (frame and focus-wise).
All in all a very good result, but a lot of time required to build up the data you want.
Cheers,
Bruce.
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