We are in honors of supplying you new SM series zoom stereo microscope. Two parallel beam paths and high quality optic system offer you high resolution and distortion-free contrast image throughout the entire zoom range, zoom ratio is 8:1, SM also use modular design, we can supply you various packages with the high resolution and the most valuable microscope. (1) Design principle: two parallel beam paths optic system, modular construction (2) Standard set: SM optic head with 1.0x plan achromatic objective (3) Zoom range: 0.62x-5x (4) Zoom ratio: 8:1 (5) Magnification: 6.2x-50x (with accessory lens: 1.9x-400x ) (6) Working distance: 80mm (with accessory lens: 26mm-296mm) (7) Field of view: 33.9mm- 4.2mm (with accessory lens: 106mm- 0.6mm) (8) Interpupillary distance: 50mm-75mm (9) Dioptric correction: +5 -- -5 (10) Optional objective: planachrmatic: 0.32x , 0.5x, 0.63x achromatic: 1.6x, 2.0x (11) Optional eyepiece: WFH10x-D/21, WF16x, WF20x, WF25x, WF40x