它带有一个迅速并且几乎无声的对焦系统，这使它成为理想的录像镜头。
It has an extremely fast and almost silent focusing system, which makes it an ideal lens for video recording as well.
对焦速度与精度是自动对焦系统中最重要的两个参数，它们决定系统能否迅速地定位到焦点处，以获取清晰的图像。
The velocity and precision are two important aspects of the auto-focus system. They can decide whether the system can quickly locate the focusing point to obtain clear image.
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