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You should note that with Ha your DSLR will only see 1/4 of the total intensity (or a decreased resolution) due to the Bayer filter.
Bayer filter is a 4-channel filter (red/green/green/blue) and all DSLRs have it. The DSLR sensors are mono but the colour can get reconstructed after light goes through the Bayer filter. With Ha you won't see anything in the green (two) and blue (one) channels.
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