SZM7045T-STL2 Continuous Zoom Stereo Microscope Gain: Standard configuration: 7X-45X, optional eyepiece and auxiliary objective lens can be expanded to 3.5X-270X, continuous zoom Eyepiece: Standard configuration: 10X/20mm, large field of view, wide angle, high eye point, providing convenience for observers wearing glasses Objective lens: 0.7X-4.5X continuous zoom , objective lens zoom ratio 6.4:1 to ensure the 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/