Request InfoEdmund Optics Inc.Edmund Optics TECHSPEC® calibration-grade precision aspheric lenses provide the ultimate in performance and precision available from off-the-shelf polished aspheric lenses. They provide an impressive aspheric surface accuracy of 0.25 μm rms. With high numerical apertures of 0.50 and 0.66, they are ideal for improving the efficiency of low-light-level detection systems or for applications requiring a compact optical path. 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