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Ok, thanks for that tip Greg, Andrew, Marc & James.
I've posted this on the QSI group and emailed QSI support direct as well. I dont know if there's any other way I can check if the tec is working. The camera ran all night without problems. My 20mins subs appear to be fine (see my M16 post today in the Deep Sky section).
Just the 120 sec flats show the banding when taking them this morning.
James the flat sub duration is based on very early morning light, in overcast foggy conditions through 5nm NB filters at f5.6.
Cheers
Andy
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