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。
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.
作为视野稍微大于50 mm定焦的镜头，35 mm镜头在拍摄风景和远景时提供了更多的灵活性。
For a slightly wider view than a 50mm prime, a 35mm lens offers more flexibility when shooting landscapes and vistas.
这种宝贝可以录下高清的，720p MPEG4的连续镜头，或5百万像素的高质静态图片，视野135度内的都可以拍到。
These babies can record high-definition 720p MPEG4 video footage or 5 mega pixel quality still photos in with a 135 degree field of view.
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