Stereo zoom optics Zoom range 10-80(120X) Zoom ratio l:4 Working distance:95mm The range for adjusting the visual distance:55-75mm The range for adjusting the diopter: 士5 The range for adjuring the focus: 50mm Optic head and stand tilt to a more natural 40°viewing angle Three kinds of illumination fields Tungsten-halogen darkfield/brightfield illumination with sliding affle Rheostart to vary darkfield/brightfield intensity Adjustable iris diaphragm to control width of light beam Fluorescent illumination simulates north daylight, ideal for diamond color grading, and facilitates identification of surface oharacteristics Work normally in 90-230V voltage range and the lamination is steady Built-in optical-fiber illumination system |