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Class 2 sensors have been the norm for ages. I don't know if there is any real gain in astrophotography from a Class 1 sensor. Richard Crisp has shown identical results with an Engineering Grade sensor.
With good calibration those little defects go anyway.
When you consider how noisy CCD cameras were 5 years ago and the great results obtained using them the little noise showing up now is nothing.
You'd better off saving the extra dollars and buying 3nm narrowband filters.
Greg.
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