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Surprised about needing longer exposures.
What Mag star are you aiming at? I centre up a mag 5-6 star and with luminance, my exposure times are ~1sec or shorter with Bin 1x1. I've not gone much longer for fear of saturating the pixels. This is an f7, 130mm refractor. I might have to try longer exposures and have a good look at the histogram.
DT
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