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At an astrocamp in 1979, a friend of mine hand guided an exposure for 30 minutes. When I say hand guided, the scope had no motor drive, he was turning the knob on the end of a flex cable by hand to track the scope and camera - quite common in those days.
I wasn't at that astrocamp but I heard about it afterwards. He finished the exposure and then next thing there was a series of loud expletives when he discovered his camera was set to 1/125s not bulb.
It seems to me that these days, if you make a mistake like that but the automation is doing all the work while you are inside enjoying watching a movie with the kids, it's no real loss.
Joe
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