Main Body Highly rigid, vibration free single piece (base, column & arm) Aluminum alloy casting, with transmitted light, power supply & brightness control integrated in the base. The frame is stable, strong, big & easy to carry. Pure white body with blue on the both sides is fresh and vivid design. Optical System Infinity color corrected optical system Viewing Head 30° inclined Siedentopf binocular head, interpupillary distance: 50-75mm, ±5 diopter adjustable, 360° rotatable Eyepiece Wide Field plan eyepiece 10x, FOV 20mm with diopter setting Etc.