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What gain are you using, Gavin? I just did the calculations for my ASI1600mm and ASI294MC to figure out how many flats were needed to get reasonable SNR and the numbers were a bit scary at high gain. I have been running the 1600 at gain of 200 and it turns out I need 252 flats to get my minimum preferred SNR of at least 50:1. The ASI294 at unity gain of 120 is not so bad at 68 flats.
Cheers,
Rick.
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