SZ6745-B8L Continuous Zoom Stereo Microscope Gain: Standard configuration: 6.7X-45X, optional eyepiece and auxiliary objective lens, magnification can be expanded: 3.35X-270X continuous zoom. Eyepiece: Standard configuration: 10X/22mm, large field of view, wide angle, high eye point , providing convenience for observers wearing glasses. Objective lens: Standard configuration: 0.67X-4.5X continuous zoom objective lens, zoom ratio 6.7:1, ensuring parfocality of the image plane. Illumination: A variety of fluorescent and LED ring lights are optional; see the external light source parts diagram for details. Click to more info: https://www.microscope-manufacturer.com/