I could only say that for the 533 sensor (it doesn’t really matter if we call it ZWO or Omegon or RisingCamera) the optimal gain for the max dynamic range is 100. At least, this value appears at the official graphs, sharp cap analysis, and from other owners.
PS. Light pollution affects the result of unity gain? Cause I’ve run those tests under Bortle 8.
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Please note that for ZWO the gain is in 0.1dB units , so 100 gain is 10dB. Omegon gain is linear in 0.01 units, so 10dB is about 301 (times 3.01).
You can see that in the table from SharpCap, there is a column in dB.
So ZWO gain 0 is 0dB and that is gain 100 in the Omegon. That should give you maximum dynamic range.
ZWO gain 100 is 10dB and that is gain 301 in the Omegon (closer to 309 in the data you posted, because of non perfect linearity). This should give you unity gain.
I expect to receive mi Omegon camera today, so I'll post my SharpCap results to compare with yours).
I think that unity gain is not affected by light polution, as it is a property of the A/D converter.
I have one question, what value do you use for offset? The dafault offset in the ASI533MC ASCOM driver is 70, but I have seen nothing about the Omegon. I expect them to be the same as it is given in ADU.
Edited by fbitto, 16 February 2021 - 09:27 AM.