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。
Then there is the camera, the telephoto lens, and the cellphone with a camera.
然后就是相机、长焦镜头、带摄像头的手机。
For example, Nikon's $399.95 P500 offers a 36x zoom -- the equivalent of an 810 mm telephoto on a 35 mm camera -- but easily fits in a laptop bag.
比如，尼康售价399.95美元的P500可以变焦36倍——相当于在35毫米相机上装一个800毫米的长焦镜头——还能够轻而易举地放入手提包里。
You may use a zoom or telephoto lens on your camera.
你可以在照相机上安装可变距镜头或摄远镜头。
You may use a zoom or telephoto lens on your camera.
你可以在照相机上安装可变距镜头或摄远镜头。
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