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It’s a difficult one, there are pros and cons to both sensors.
ASI1600
- Higher QE means it’s more sensitive BUT also means you’ll get more purple halos around stars.
- Higher resolution (16mp vs 9mp) but the smaller pixels means it stresses the optics more.
- Lower read noise is just a benefit as it means shorter exposure times, especially for narrowband.
- Both have a micro lens diffraction pattern BUT the QHY9 is a LOT nicer than the ASI1600.
- Same size sensor
- Much faster download times. The ASI1600 is around 2s while the QHY9 is around 8s.
Depending on the colour correction of your refractor the QHY9 could give better LRGB images.
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