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| Adjustable length range of left or right foot | 0---20mm |
| Nose Range of adjustment | adjustable length: 0≤22mm; Angle: 360° |
| Effective internal aperture of mirror frame | 33.5mm |
| Number of lenses inserted when left or right frame are used | 5 pieces (front 3 rear 2) |
| The lens rotates around the optical axis in the inner circle of the lens frame | 360° |
| The difference between the optical center and the geometric center of the lens | ≤ 0.5mm |
| The displacement of the lens relative to the geometric center of the frame | ≤ 0.3mm |
| The lens optics The Un parallelism between the axis and the geometric axis of the frame | ≤ 2.5° |
| PD Scale | 48-80mm |
| N.W | 53g |