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We don't aim for 30 minute narrowband sub with the ASI1600, they are not necessary. With the ASI1600, you get high sensitivity and very low noise. Narrowband does not require very long subs with this camera, 300 seconds is enough at Unity Gain settings. There are plenty of examples in the Astrobin ASI1600 group it is worth having a look through those images. Shiraz here on IIS has produced a suggested optimal broadband chart for this camera, and Beta testers on Cloudy Nights did a lot of work on settings and exposures.
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