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Thanks folks. I never expected to get dusk to dawn on my first attempt - I was sure something would go wrong. But it kept clicking away. From a distance I could check all was working - The camera would flash a front red light during the 2 sec mirror-up period.
Mind you, if you were there, you wouldn't have thought it was dusk and dawn. 18 sec exposure whites-out the frame without much light! It was actually quite dark to the eye when I started the sequence and I have many pure white frames at the end before I woke up at 6:30am and came and shut it down.
I managed to have the camera looking out a doorway, so I didn't have dew to content with.
I don't know how people do a sequence from sun in the sky through to dark and back to sunrise - their cameras must be clever enough to adjust exposure. I just had fixed aperture set on the old lens and fixed shutter open time (set by DSLR Shutter). But if the camera is auto-adjusting, I would get the effect I got in the dining room sequence - exposure variation between frames - light to dark and back again - not sure why?
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