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mmm, 2.5mins is not good for a 4nm Ha filter, even on a 20".
The result for just 5 off 2.5 min is amazing, but a single 12 min pic would have been better. If readout noise is dominent, stacking doesnt reduce it.
If you can, do 15-20min subs, even just a few, then you will see some real magic.
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