THESE ARE BRAND NEW SPHERICAL PRIMARY MIRRORS 135mm Diameter Diffraction Limited L4 (1/4 wave in Sodium Light) Plate Glass Aluminized(92%) and SiO(Quartz Overcoat) Resolving Power(arc seconds): .97 FL (focal length) 1000mm Pre Set Collimation Dot hand Crafted and Ronchi Tested for high ReflectivityPlease see other listings for secondary mirrors for those that like to build their own telescopes. FREE ship rate is for within the Continental U.S. Thanks, Mary
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