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Halpha is a definite wavelength 656nm., so as long as the bandwidth of the notch filter includes that wavelength, it shouldn't make a lot of difference except cutting off red and IR emissions from other sources other than Halpha.
The narrower the bandwidth , the longer the exposure needed.
Aren't the very narrow band Halpha more suitable for solar prominence observing ? (the very narrow bandpasses mean they either absorb or reflect most the light that falls on them)
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