Specifications Optical system Greenough Zoom range 7.5x~45x Observation angle 45°tilt Objective 0.75x-4.5x Zoom ratio 6 : 1 Eyepieces WF10x/23; Adjustable visibility of eyepiece Pupil distance 50mm-75mm Working distance 110mm Column stand Base size: 220*280mm, Focus range: 45mm Illumination 4.5W High brightness adjustable LED Optional Accessories Eyepieces N-WF15x/16 N-WF20X/13 Additional objective 0.3x [WD=301mm] 0.5x [WD=191.8mm] 0.63x [WD=142.7mm] 0.75x [WD=128.6mm] 1.5x [WD=56.3mm] 2.0x [WD=38.6mm]