One tip that comes to mind, is don't use the preview function.
If you want to play around with exposures longer than the 15 seconds allowed by the spin buttons or whatever they are called, just click in the live exp time window and manually enter the time you want in seconds. eg. 3.00 would be entered as 180.0.
The advantage of this is that you get auto repeat on your preview exposures while adjusting gain and offset etc. The manual doesn't tell you can do this, but it works.
best,
Doug
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