Specifications: The optical imaging system:infinity optical system, tube lens focal length 200mm; optical magnification50x-500x.

Eyepiecetube: Hinge type three mesh tube, an angle of 30°, the interpupillary distance 55-75mm;high point, wide field eyepiece WF10X/22.

Flatfield apochromat: 2X/0.055, 5X/0.14,  10X/0.28,  20X/0.29, 50X/0.42

Instrumentaccuracy: ±(2+L/200)μm

Repeatability:2μm