SMZ-171-TP Greenough zoom optical system Trinocular head, 45º inclined, 360º rotating 100:0 (eyetubes), 0:100 (right eyetube/trinocular tube) optical split Widefield adjustable eyepieces N-WF10X/23mm 6.7:1 Zoom ratio, WD=110mm Objective magnification range: 0.75X-5X Pole type plain stand and head holder Coarse focusing system with tension adjustment Black/White stage plate and dust cover