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The offset with a QHY600m is set in the driver. I use Sky X and there is a plug in driver for Sky X. In the setup box you set the mode, the gain and the offset.
In my limited experience I have found I got good calibration using mismatched lights and calibration files with regards to mode, gain and offset.
The settings I use for QHY600 are:
1. Mode 0 Gain 26 Offset 40 for broadband objects.
2. Mode 1 Gain 56 Offset 50 for narrowband.
These seem to work well. There is also the mode 2 high gain mode with double sampling for extended full well. I would use that in an object with a very bright star in the field along with short exposures.
I also sometimes see black specs in calibrated files but these clean up using data rejection in CCDstack removing hot and cold pixels. Mostly see these in narrowband images and also seen them with CCD cameras as well.
The differences in my opinion in exposures done with the various modes are not that different one to the next. But enough of a difference to make it worth while. The increased library of calibration files though is just another layer of complexity so that is a moderating factor.
Greg.
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