当你继续研究比较昂贵的变焦镜头时，你会发现它们有着恒定的光圈。

As you move onto the more expensive zoom lenses, they maintain a constant aperture.

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所有的变焦，聚焦和镜头移动调整手册。

All zoom, focus, and lens shift adjustments are manual.

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他告诉我的那时候我刚买了第一个70- 200 mm的变焦镜头。

He told me this just after I bought my first 70-200mm lens.

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它也有内龹置的变焦镜头。

It has a built - in zoom lens as well.

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当你在拍摄视频时使用光学变焦镜头，这款相机的优点就体现无遗。

This camera shines when you use the optical-zoom lens while shooting video.

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当你在拍摄视频时使用光学变焦镜头，这款相机的优点就体现无遗。

This camera shines when you use the optical-zoom lens while shooting video.

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