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Hi Chris,
I have never tried it, so I'm only speculating here.
If the object has strong Ha emission your OSC will get it all anyway. Like Eta Carina or Rosette.
The Ha filter would be useful where there is weak Ha emission and is swamped by the broadband signal. Like in galaxies etc.
From what I have read you could also image with the Ha filter under a bright moon.
Cheers
Bill
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