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Hi Peter thanks for that I will try those settings tonight.
The settings I got last night was gain 0 offset 123 but found the street lights 20k's away were still producing FWFM of 12+ and a max value well above 65000.
I'm using one of Peter's(Exfso) light boxes which has an adjustable brightness setting. Having the brightness turned down below half and an exp. of 2secs my max values are very high. Using 1 sec exp they're well below 65000+ mark.
Alistair, reading the QHY8L manual it says to get offset then gain, then go back and check offset again to fine tune it.
So how long an exp. should you take and how bright. As adjusting either of these changes things.
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