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Cooled CCD

To record and process long exposures of Deep Sky objects requires that the camera be effectively cooled to reduce noise in the image. Moreover it helps greatly if the image is rendered in high bit depth, ie has lots of shades of Grey between Black and White for a Monochrome camera or shades of each primary colour for a Colour camera. Many cameras used for presentation, such as video and webcam types, use only 8 bits (256 shades) but most CCD cameras designed for long exposure Astro-Imaging use 16 bits. Pixel size amongst the many sensors used varies greatly and has a bearing on sensitivity, larger pixels are generally more sensitive. Sensor size also varies with larger types becoming more common and affordable.

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