Furthermore, the selection of the double telecentricopticalsystem ensures the correction of the trapezoidal distortion introduced by the tilt object surface.
选择双远心光学结构，便于对倾斜物面所产生的梯形畸变进行矫正。
2
The opticalsystem only consists of three germanium lenses with a "negative-positive-positive" reversed telephoto telecentric structure in the image space.