Observing
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OverviewCCDs have revolutionized astronomical imaging. With earlier photographic plate technology one had a different detector for every exposure. Because the same CCD detector is used for all exposures, it is possible to correct for its defects with one set of calibrations. By combining many of these corrected CCD exposures it is then possible to image far fainter objects. Another CCD advantage is its huge dynamic range in the stored image: from ten electrons to as much as 200,000 electrons per pixel. |
