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Canon D80? Not sure I've heard of that. If it's a digi camera your using, there may be an option for long exposure noise reduction somewhere in the menus, this effectively means that a second 'black' exposure is taken after each shot you take and it merges the two images together to eliminate/reduce noise.
This also means that your time between taking shots is increased by 2. If you take a 2 minute exposure, the 'black' exposure the camera takes for you will be 2 mins also.
Something to try and see if it works for you.
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