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You could try using PHD. It will stack the short exposures to emulate a longer exposure;
Quote from PHD help file
"For example, if you use a short-exposure webcam your maximum true exposure duration may be 1/30th of a second or so. If you select "1 s" from the exposure duration, PHD Guiding will automatically acquire images for one second and stack them on the fly, using the resulting stack as the guide frame. "
Geoff
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