Performance indexes:

1) pupil distance adjustment range: binocular pupil distance 48 ~80mm, left or right pupil distance 24 ~40 mm; Minimum scale value 1mm

2) the axial scale of the dividing disk is 130 °~ 0 °~ 120 °on the left and 50 °~ 180 °~ 60 °on the right. The axis scale increases counterclockwise along the axis of the mirror frame. The effective internal aperture of the frame is 5 °

3) Effective internal aperture of mirror frame: 33.5mm

4) Number of lenses inserted when left or right frames are used: 5pieces (front 3 rear 2)

5) the lens rotates around the optical axis in the inner circle of the lens frame is 360 °

6) the lens optics The unparallelism between the axis and the geometric axis of the frame: ≤ 2.5 °

7) the difference between the optical center and the geometric center of the lens: ≤ 0.5mm

8) the displacement of the lens relative to the geometric center of the frame: ≤ 0.3 mm

9) nose Range of adjustment: adjustable length: 0 ≤ 22 mm; Angle: 360 °

10) adjustable length range of left or right foot: 0~20mm

11) weight: 53g