This is a 7X-90X zoom magnification trinocular stereo microscope head. It includes a 2.0X Barlow lens, a pair of super widefield high-eyepoint 10X eyepieces and foldable eyeguards. It comes with 45-degree inclined 30mm eyetubes with diopter. Its trinocular port enables to add photo or video capability. 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 to 90X Continuous Zoom Magnification Power 45-degree Inclined Trinocular Head with SUPER WIDEFIELD High-Eyepoint Eyepieces Trinocular port for adding photo or video capability 30mm Super Widefield WF10X Eyepieces with 20mm Field of View 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 Working Distance 4" (100mm) 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 Trinocular 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") Photo-port CX-type slide-adjustable 23mm photo-tube 2.0X Barlow Lens Modifier 2.0X Objective Resolution 390 lp/mm @ 9X Objective Magnification Range 1.4X-9X Working Distance 4" (100mm) Field-of-View (10X Eyepieces) 2.2mm-14.3mm Magnification Chart Eyepiece Objective Standard 2X Barlow 10X 7X-45X 14X-90X Packing List: One Trinocular Stereo Zoom Head One Photo Port One Hex Wrench One Pair of SUPER Widefield 10X Eyepieces One Pair of Foldable Eye-Guards One 2X Barlow Lens