What are the improvements of Yuzhong 70sav4?

Yuzhong70AV4 has made a high-end improvement on the shooting function of the camera. 202 1, 1, the tail fiber structure of Yuzhong 70SAv4 has an excellent imaging circle of 45mm, which meets the requirements of full-frame camera photography. Due to the special optical structure, the newly designed aluminum alloy mirror 70SA is a part of the objective lens, and there is an optical component with the largest light transmission in the middle section. Compared with previous generations, the design here has been improved, which can not only meet the problem of mirror sliding at present, but also effectively reduce the influence of excessive locking of the hoop on imaging. Newly designed 2.8-inch aluminum alloy focusing base, two-speed tooth-shaped focusing, thicker focusing tube, high extinction inner wall treatment, no pressure for connecting full-frame camera.