A zoom system (10) for an optical stereo device is provided. The zoom system (10) comprises a front plate (30) and a lens plate (60) disposed in a fixed spatial relationship and defining two optical paths within the zoom system (10). The zoom system further comprises a zoom plate (40) having two lens assemblies (45a, 45b), wherein the zoom plate (40) is disposed between the front plate (30) and the lens plate (60), and a compensation plate (50), wherein the compensation plate (50) is disposed between the zoom plate (40) and the lens plate (60). The zoom system further comprises a drive spindle (20) having a helical groove and a cam disk portion for simultaneously adjusting the position of the zoom plate (40) and the compensation plate (50) relative to the front plate (30) and the lens plate (60) in a coordinated manner, wherein the position of the zoom plate (40) is adjusted by means of the helical groove and the position of the compensation plate is adjusted by means of the cam disk portion of the drive spindle (20).