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The field of view of a microscope is limited by the geometric optics and by the ability to design optics that provide a constant aberration correction over a large field of view. If a scanning arrangement is used, the objective can be used over a continuous series of small fields and the results used to build up an image of a larger region. The concept has been harnessed in the confocal scanning microscope. Confocal microscopy’s main feature is that only what is in focus is detected, and anything out of focus appears as black. This is achieved by focusing the ...(100 of 7860 words)