3.5X-90X Extremely Large Zoom Magnification Power Trinocular Design for High Quality Photo, USB PC and CCD Video Imaging Erect Stereo Sharp Images Over a SUPER Widefield of View Accurate Alignment Ensuring Fatigue-Free Long Time Viewing Crystal Clear Original True Color Images 45 Inclined Trinocular Head with SUPER Widefield High-Eyepoint Eyepieces 30mm SUPER Widefield Eyepieces (see the difference in the above picture) Both Ocular-Tubes with Adjustable Diopter Adjustable Interpupillary Distance Full Optical Glass Elements Precise Ground Glass Lenses 4" (100mm) Extremely Large Working Distance Versatile Boom Stand Covering Large Working Area Double-Arm Design for 3-Degree Freedom Able to Place Microscope Head Toward to Any Direction Heavy-Duty Cast Steel Stand Finished with Stain Resistant Enamel Rugged Solid Cast Steel Base 30mm SUPER Widefield Eyepieces Included 165mm and 30mm working distance auxiliary objective Head: 45 inclined 360 swiveling trinocular Eyepiece: 30mm super widefield high-eyepoint WF10X/20mm Objective: 0.35-9.0X Auxiliary objective :SZM0.5X & SZM2.0X Zoom Range: 6.4:1 Diopter Adjustment: 5dp Interpupillary Distance: 2-3/16" - 2-15/16"(55-75mm) Field of View: 2-1/2" (65mm) in diameter Working Distance: 4" (100mm) Boom Stand: 20" double-arm (overall length: 30"), 17" high pillar, 10-1/4"x8-1/4"x2-0" solid cast steel base POWER/MODE: This camera is plug-in to power on, long press the button for 3 seconds to power off, then short press for 1 second to power on. Power on success if you hear ticking with red indicator light on. After power on, short press for 1 second to change to video mode, press one more second to change to picture/video playback mode, one more press back to camera mode. MENU： Short press the button for 1 second and enter menu setting page. Use UP/DOWN button to select related funtions and press OK button to enter submenu. a) Chinese/English language settings: use UP/DOWN button to select and press OK button to confirm; b) Grid line settings: press UP/DOWN to select line and press OK button to enter, press UP/DOWN to open/close 10 grid lines rulers, to open/close 8 grid lines, every line’s direction, position, color or width, then press OK to change the line’s direction, position, color or width. Press MENU button again to return to upper level menu; c) Exposure setting: press UP/DOWN to select auto/manual exposure mode, then press OK to confirm; d) EV settings: under auto exposure mode, enter to select +-0.3/0.7/1.0/1.3/1.7/2.0 exposure value as needed; e) White balance settings: can select auto, manual or one-button-calibration mode after entering, there might be color deviation if you change the light, then you can put a white paper and select one-button-calibration to calibrate the color.