[xelasnave]

When I think of the things that catch you out it seems we get a never ending list.
Here are a few things.
Never assume if left over night your polar align is still good.
I have had my tripod sink a little and although great one night the next night you wonder why you have star trails.
Power..I thought my battery was charging from the solar panel yet it was not functioning.
So chech the battery before starting with a multi meter.
Last time out I was caught out and lost 20 minutes because the mount stopped...I thought the battery had charged from the panel but not enough for a full run.
Always check anything that depends on a screw to hold it in place...
Check your focus regularly as it can go off..if using a dslr blow up your image and just dont look at the unenlarged screen and think that it looks ok...a blow up will show how focus is now and not after.
Make sure after playing around to put a fresh battery in the camera.
And make sure you are charging the next one.

I could think of many more but I wonder if someone else has something that has bitten them and ruined a good run.
Alex