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。

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A kind of diffraction element modulating phase information by LC space light modulator to get a zoom Fresnel lens, as well as the using of said element to optical imaging system, is introduced.

本文介绍一种以液晶空间光调制器作为调制位相信息的衍射元件，获得可变焦长的菲涅耳透镜，以及该元件在光学成像系统中的应用。

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Zoom lens plays an important role in the optical information capture of the whole optical system.

变焦距物镜组对整个系统的光学信息传递有着重要的作用。

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The Z80 features a 3X optical zoom, face detection and an intelligent focusing system that locks in the correct focus, while the Z200 rocks a 4X optical zoom and wide angle lens -- down to 28mm.

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