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How to record the digital sky

Run through these tricks of the CCD trade and you'll be capturing digital sky images in no time.
One night was all it took. I was hooked after my first encounter with CCD imaging. I can still recall the thrill of seeing the images pop onto the computer screen seconds after the camera's shutter closed. Just as impressive was the fact that the images were unguided, 1-minute, deep-sky exposures — a far cry from the 2-hour exposures and film processing that I was used to with astrophotography. While film-based astrophotography and digital astroimaging share similar goals, their difference...

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