New from AmScope, this is a 6.7X-45X zoom magnification trinocular stereo microscope head with our top optical systems, offering premium-level sharp clear erect stereo images over a large zoom magnification range. It includes a pair of focusable plan PL10X/22 eyepieces with foldable eye-guards. Its trinocular port enables the addition of photo or video capability and can be turned on by pulling the shutter pin outwards while pushing the pin back in switches back to binocular mode. It comes with 45-degree inclined 30mm eye tubes. The extreme widefield optics and high-eyepoint design ensure an easy and comfortable observation. This microscope head fits stands with a 3" (76mm in diameter) collar. Enhanced features include the ability to set a minimum magnification level by locking the zoom knob, adjustable zoom click intensity, and a shutter pin to switch back and forth between binocular and trinocular modes. Features: 6.7X-45X Continuous Zoom Magnification Offering Top-Level Quality Images 45-degree Inclined Trinocular Head with Extreme Widefield High-Eyepoint Eyepieces 30mm Plan PL10X/22 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 Working Distance 4" (110mm) Accurate Alignment Ensuring a Fatigue-Free Viewing Full Optical Glass Elements Precise Ground Glass Lens All Metal Mechanical Components Adjustable Interpupillary Distance Shutter Pin - Switch Between Binocular and Trinocular Magnification Level Lock Zoom Wheel Click Adjustment Rubber Eye-guards 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 Sliding, 54-76mm Ocular-port Diameter 30mm Dioptric Adjustment Both oculars, ±5dp Eyepieces 10X Focusable Plan PL22 high-eyepoint extreme wide-field Objective Lenses 0.67X-4.5X zoom Objective Numerical Aperture 0.0715 @ 4.5X Objective Resolution 214.5 lp/mm @ 4.5X Field-of-View (10X Eyepieces) 4.9mm-31.4mm Working Distance 4" (110mm) Auxiliary Lens Mount 48mm Collar Mounting Size 76mm (3") Photo Port 23mm Packing List: One Trinocular Stereo Zoom Head One Pair of Focusable Plan PL10X/22 Eyepieces One Pair of Foldable Eye-Guards One Dust Cover One Photo Port