CCD Astrophotography

CCD's use the photo-electric effect. Silicone release electrons when exposed to light. A CCD is composed of pixels. The resolution of a CCD chip is the total number of pixels.

One of the factors that make CCD's superior to film is its linear capability - that is twice the exposure means twice the light, unlike the reciprocity failure of film.

Since the image from a CCD is digital - hence binary - any defect in the image can be cancelled out by using reduction techniques. By subtracting the Dark, Bias, and Flat frames from an image, a better image (and more accurate image) results.



http://astronomyonline.org/Astrophotography/CCD.asp






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