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Category : Optics (components, coatings, instruments and systems) > Optical lenses, mirrors, (auto)collimators
Achrovid Nelsonian Objectives for video inspection microscopes
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Although video inspection microscopes play an essential role in high magnification process monitoring and machine vision, they have invariably been equipped with objectives primarily designed for visual purposes. In video terms, such objectives have stated numerical aperture (N.A.) ratings that are more theoretical than practical. This is because "visual-dedicated" objectives "presume" that an end-user will constantly monitor each image to obtain a proper balance between contrast and resolution—through either an adjustment of condensing optics, a variation in aperture—or both. Unfortunately, it is impractical to monitor each image and adjust this balance on an individual basis in automated video applications or where many objects are being constantly examined. Moreover, the cross-over point between resolution and contrast occurs at less than full aperture (full N.A.).
Article from INFINITY PHOTO-OPTICAL
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