... LZJ-6E dental and ENT operating microscope with 1, the primary mirror, the optical tube hinge operation, the ... ), optional 250mm apochromatic objective. 3, the primary mirror with a damping control system that moves the optical lens ... the process in operation during the operation. 8, the spring arm with a circuit limit, carried to disconnect, ... zoom, zoom magnification: 3.4X, 5.1 X, 8.3 X, 13.5 X, 20.5 X3, ...