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Image artifacts - Telescope and camera defects Some artifacts are caused by defects in the cameras or optics used to take the images. The most noticeable example of a camera defect is shown below. This is a small fiber on the surface of the Charge-Coupled Device (CCD) camera for the COR2 telescope on STEREO Ahead. The total length of the fiber is just 1 millimeter. It has been there since launch. Most likely this fiber came off of one of the clean room wipes used during the assembly of the camera. Even though the material of the wipes is selected to shed as few particles as possible, the occasional particle does end up inside the instrument.
Originally posted by Illustronic
Now, is there a point to this thread?