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This may be a little off piste, but since you’re using an astro ccd with no UV/IR cut like a DSLR would suffer with, surely you’d expose your red about the same? Well, maybe a bit longer... depending on the QE of your sensor...
The Ha is just a more stringent LP filter... of course you’d be best to experiment to ensure you’re taking sky limited subs, and I know old fashioned CCDs have horrendous read noise compared to a 1600, but surely it’d be worth a shot?
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