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ZWO and QHY have typically used different scales for their range of possible gain values, so it’s entirely possible that their offset values are not portable between the two (although that does not necessarily mean not translatable)
What’s important re: banding is that the sensor is consistent. It would be interesting to see how the 6200 performs in this respect.
Some earlier Sony sensors suffer quite badly from inconsistencies caused by built-in (re)calibration from one power cycle to the next. The implementations of the 178 are a good of example of this and consequently can be more tricky to calibrate well.
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