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Hi,
When I control my camera set to bulbmode from computer or a wired intervallometer it's common the exposure time could be little bit different, parts of a second. It doens't matter normally, but when I use Deep Sky Stacker, DSS I can see it's very sensitive when matching image and dark frames. Sometimes part of second could make it to refuse to calibrate.
If you set the camera in manuell mode you get more precision becuse then it's the cameras own electronics that controll the shutter. But then you are limited to 30 seconds exposures.
As told earlier here, a delay between exposures is good. For me it works with 7 seconds delay, shorter and it could be problem to finished the download to the computer, I I store the imgae on cameras own memory it's faster, but depends on the memory card.
Sometimes i want the pause betweem images be as short as possibly. Then I set the camera shutter to continouos mode. Then just one second delay will be enough. Somthing I use when doing meteorshower hunt. But expect the camera be hot and a little bit more noise.
/Lars
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