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I tried the H-alpha filter on the ASI071 OSC camera the other night. Wow the background is low - with 5 - 10min subs !
Is it worthwhile using a higher gain for the H-alpha shots so that its easier to swamp the lower read noise at the higher gain?
I've been shooting at unity gain which has read noise 2.6e-. At higher gain RN is ~ 2.3e-. Maybe that's not much better?
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