This 7X-45X zoom magnification binocular stereo microscope head includes a pair of super widefield high-eyepoint 10X eyepieces and foldable eye guards. It comes with 45-degree inclined 30mm eye tubes with diopter. The microscope provides sharp clear erect stereo images over a large zoom magnification range. Its super widefield optics and high-eyepoint design ensure an easy and comfortable observation. This microscope head fits stands with a 3" (76mm in diameter) collar. Features : 7X-45X Continuous Zoom Magnification Power 45-degree Inclined Binocular Head with SUPER WIDEFIELD High-Eyepoint Eyepieces 30mm Super Widefield WF10X/20 Eyepieces High Resolution with Great Flatness and Contrast Sharp Stereo Erect Images over a Wide Field View Crystal Clear Original True Color Images Both Ocular-Tubes with Adjustable Diopter Large 4" (100mm) Working Distance Accurate Alignment Ensuring a Fatigue-Free Viewing Full Optical Glass Elements Precise Ground Glass Lens All Metal Mechanical Components Adjustable Interpupillary Distance Rubber Eyeguards Included Manufactured under ISO 9001 Quality Control Standard Excellent Five (5) Year Manufacturer Warranty Specifications Microscope Head Head Type Binocular Optical System Greenough stereoscopic Ocular Incline 45° Interpupillary Adjustment Compensation-free gemel, 54-76mm Ocular-port Diameter 30mm Dioptric Adjustment Both oculars, ±5dp Eyepieces 10X FN20mm wide-field, high-eyepoint Objective Lenses 0.7X-4.5X zoom Objective Numerical Aperture 0.065 @ 4.5X0.02 @ 0.7X Objective Resolution 195 lp/mm @ 4.5X60 lp/mm @ 0.7X Field-of-View (10X Eyepieces) 4.4mm-28.6mm Working Distance 4" (100mm) Auxiliary Lens Mount 48mm Collar Mounting Size 76mm (3") Packing List : One Binocular Stereo Zoom Head One Pair of SUPER Widefield 10X Eyepieces One Pair of Foldable Eye-Guards