You won't let me use the optical zoom while I'm shooting video; in fact, you can't refocus while shooting video, either.

你不让我在瞄准镜头时用光学变焦，而你也不能边拍照边聚焦。

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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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In this paper, the selection of optical scheme, the choose of zoom mode and the mechanical design of the zoom cone have been deeply expounded and studied.

本文从其光学方案的选择、变倍方式的选用，变焦镜筒的结构设计多方面进行了深入阐述和研究。

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Adding even more, the new HMX-U20 now puts a true 3x optical zoom in the palm of consumers' hands, allowing for additional creativity when recording life's special memories.

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The 28mm wide-angle lens with 5x optical zoom aids in capturing great shots from a distance.

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Taking HD video to the next level, the COOLPIX P7700 is capable of intelligent autofocus while recording in any mode as well as optical zoom when shooting in Auto mode.

ENGADGET: Nikon intros flagship Coolpix P7700 for prosumers, diminutive Coolpix S01 for fashionistas