2. The axis scale of the indexing plate: 165 degrees to 0 degrees to 180 degrees to 25 degrees, the axial scale is distributed counterclockwise along the axis of the frame,Its ruling interval is 5 degrees;
3. The degree of rotation of the lens around the optical axis in the frame: 360 degrees;
4, left or right mirror foot length adjustment range: 90mm ~ 99mm, each specification from small to large increased 1mm.