Eventually, more advanced versions of the lens could be used to provide a wealth of information, such as virtual captions scrolling beneath every person or object you see.

最终，可以用更先进的隐形眼镜来提供丰富的信息，比如在你看到的每个人或每样东西下面滚动显示一些虚拟字幕。

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In another, they used a telephoto lens to take pictures of a set of keys on a cafe table from the roof of a university building.

在另一次演示中，他们站在一所大学的楼顶上，通过远摄镜头拍到了咖啡桌上的一串钥匙。

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As we rode, I used the zoom lens on my camera to scan the crest of a hill above us.

行进中，我通过相机上的变焦镜头扫视我们上方的山峰。

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To get the shot, I made my way onto the creaky outdoor balcony of a neighbouring shop, and I used a telephoto lens to snap from a relatively safe distance.

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The light, compact 3x zoom lens covers a frequently-used range of focal lengths from wide-angle 18mm to standard 55mm (35mm camera equivalent range: 27-82.5mm).

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For her project, Kern says, she used only a wide-angle lens to reflect the closeness of her subjects.

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