该机械运动降低变焦速度，并增 加使用于变焦系统的空间与重量，可能引起不需要的抖动且需要较 大的功率消耗。
The mechanical motions decrease the speed of zooming, increase space and weight for zoom system, may induce unwanted jitter, and require large power consumption.
摄像机镜头的光圈、变焦、调焦控制速度可调，为精确调整摄像机镜头提供情报方便。
The aperture, zooming and focusing control speed of the camera can be adjusted, which provides facility for the precise adjustment of the camera lens.
对于专业摄像机，缩减捕获和在变焦过程中运动平稳是非常重要的，这是为什么它可能看起来，自动对焦速度很慢。
For professional use cameras, reduced hunting and smooth movement during zoom operation is very important, which is why it may seem that the AF is slow.
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