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A high-precision eyepiece for a wide range of astronomical measurements. Includes four red-illuminated, laser-etched scales for
measuring double star angular separations, position angles, planetary diameters, and lunar crater diameters, and for long-exposure
photo-guiding. Modifited Achromatic 3-element coated optics, diopter adjustment, rubber eyecup; variable LED illumination control;
batteries
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