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Thank you for your replies.
Hugh, that is what I originally had in mind. I just was not sure what to do with the OIII channel. I suppose it makes sense to use signal from all available channels.
Glen, how is Canon actually converting the image to mono? I can imagine that it is combining all 4 colour pixels which may introduce additional noise from the unused pixels. For example, for H alpha there will be light only in the red channel. If mono conversion uses the other 3 channels (GGB) it will just add extra noise and no signal to the red. Or am I missing something?
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