One limiting factor is the viewing Angle, which is comparable to using a camera lens: a telephoto lens has a narrower view than a wide-angle lens.

限制因素之一就是观察角度，这与使用照相机的情况类似：长焦镜头的视野比广角镜头的观察角度要窄得多。

youdao

The only problem with the site is the poor quality of the photographs –users tend to take the photos themselves, with a mirror, often using a camera phone in poor lighting.

这个站点唯一的问题就是照片的质量不高——用户大多数时候都是对着一面镜子或者在光线不佳的环境下用手机拍照。

youdao

But I am looking forward to making radio reports or using a camera as part of School Report.

BBC: NEWS | School Report | School Reporters' diary

Using a camera attached to a computer, smartphone or tablet, the tool can detect your pulse in just five seconds.

ENGADGET

In addition to an infrared camera and projector, the Kinect features a microchip that performs "skeletal tracking, " or following movement without using a camera lens.

WSJ: A New Game for Microsoft's Kinect