To study the structure of telecentric beam path for zoom lens system, the axial displacement equation for the stop was deduced, which keep the system telecentric in all zoom position.
进一步研究变焦距系统远心光路的结构特征，得出了使系统在整个变焦过程中都处于远心位置的光阑轴向位移方程。
Furthermore, the selection of the double telecentric optical system 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。
The optical system only consists of three germanium lenses with a "negative-positive-positive" reversed telephoto telecentric structure in the image space.
采用“负-正-正”型式的反远距像方远心光路镜头结构，仅有三块非球面锗透镜构成。
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