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Step 1
So I basically did the whole thing again this time set the exposure in Nebulosity to 0.001 (1ms) for the bias frame. Adjusted offset until the min value of image was just under 1000 i.e. 740 in my case. My Offset value was 115.
Step 2
Followed Bill's step above with Open Shutter/ and got the following results.
Exposure(sec) - Mean Pixel Value
2 - 32022
3 - 46119
4 - 52701
5 - 54265
6 - 54349
7 - 54362
8 - 54384
10 - 54370
30 - 54561
Based on above I used the 5sec marker as the exposure length and adjusted the gain. This time I looked at the max value of the image until it capped to 65,535 which for me was 16%.
I did the whole test at -10C; I'll repeat it at -20C tomorrow and then leave it as is. I'll also check if ASCOM vs Base Driver for QHY9 make a difference.
Anyway thanks everyone for the help!
Regards
YB
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