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The lens of fiberscope is often a wide-angled lens and the eyepiece is occasionally connected to a camera. Some fiberscopes come with an additional fiber to carry light from an external source for illuminating the substance under scrutiny; the additional fiber facilitates clearer viewing of the sample. Fiberscopes are used in a variety of fields such as medicine, machining, computer repair, espionage, locksmithing, safecracking, and computer forensics among several others.