Request InfoFocus Mechanism with Non-Rotating OpticsEdmund Optics Inc.BARRINGTON, N.J., Nov. 17 -- Edmund Optic's family of beam expanders offer high performance optical designs packaged in a precise optomechanical platform. Two full rotations of the focus knurl provide smooth movement for the optics in order to vary the output from collimated to the minimum focus distance of 1.2 m. The focusing mechanism keeps optics from rotating, which helps maintain bore sight accuracy and a minimally aberrated focused beam, while the focus lock secures its position. The beam expanders are easily secured to both metric and English threaded mounts. 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