Specifications Observation angle: 45°tilted Magnification of eyepiece: 16X Interpupillary distance: 50mm-80mm Diopter: ±5D Focal length of objective: F=300mm Magnification changer: 5-step: 0.4X, 0.66X, 1X, 1.5X, 2.5X Total Magnification: 2.7X, 4.4X, 6.6X, 10X, 16.6X Linear field: 90mm, 55mm, 37mm, 24mm, 15mm Fine focusing distance: 60mm Illumination: Coaxial illumination with 10W LED lamp light source, brightness adjustable, illumination>30000lx Filter: Build-in green & blue filters Floor stand: Column height adjustable fitted on the 5-jaws round base with casters With beamsplitter and video camera adapter, C-mount 1/3 inch video camera attachable Power supply: AC100V-AC240V