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Unlike some cameras (thinking some of the Sony sensors) you MUST use darks with a good number of the CMOS sensors. So using a bias on your lights becomes redundant as the dark contains the bias. Subtracting the bias from the master dark is only useful if you want to use dark scaling which also doesn’t work with the CMOS sensors as the amp glow and banding issues don’t appear to increase linearly.
There is also an arguement to be made that these glows start with relatively short exposure, maybe as short as 1s. So with this in mind it may be better to create dark flats as opposed to using a bias which also shouldn’t be shorter than 0.3s.
The QHY manual mentions not going below 0.3s as it starts creating some banding issues in the master bias of which I’ve noticed myself. So when I’ve mapped my flat times I’ve used the Lum filter at 0.5s and referenced the others from there.
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