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Taking a series of exposures at set intervals generally requires the use of a specialised interval timer, such as the Canon TC-80N3, or a Notebook computer running a software utility that comes with the camera.
In my case, for our Canon 40D, the Canon TC-80N3 can be used to program say, 20 exposures of 30 seconds duration at intervals of say, 70 seconds. The interval of 70 seconds between each 30 sec exposure allows for the 30 sec light exposure + the 30 sec dark exposure + 10 secs of download time.
However, our Canon 40D has the “special” Canon N3 style connector whereas I think the 3X0/4X0 series has the “standard” 2.5mm stereo plug connector, so the TC-80N3 will not fit?
I understand that you can get some generic interval timers on e-bay; some IIS users have these and posted good reports.
My Canon 40D also came with a software utility on CD called “EOS Utility” and by connecting the 40D to my computer using a USB cable, I can operate the camera from the computer and set a series of interval shots.
Cheers
Dennis
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