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Hello!
Reprocessing of the California Nebula (NGC 1499, Sh2-220), capture from 2021. I worked on it for two days, trying various combinations with the 4 stacks (remade as well): Ha, SII, OIII and Hb. Oxygen has a very weak signal and I had the smallest exposure time, only about 2 hours, three times less than the others. I would have needed at least 10 hours, at least for the better SNR. I tried to replace it with Hb, but it is emitted from the same place as Ha, with a smaller signal and weaker details. I didn't have a satisfactory version with Hb, so I reduced myself to completing a SHO and an HSS version, the stars being HOO.
Clear skies!