thanks again for the replies.
i will certainly take a look at Images Plus.
I have not yet been able to measure the linearity of the camera so as a test I took flats at 10K, 20K, 30K, and 40K. None of them corrected the very slight vignetting and all appeared to overcorrect i.e the corners became bright.
The start up drivers have been awful for the 600 but they have moved fast to fix those issues but I am overseas at present doing astro processing lectures so cannot resume. The QHY600 has 3 readout modes necessitating at least 3 different bias/gain/offset values making things more complicated.
Cheers
Martin
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