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。
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However, after the shock subsides and the person is able to look back through the lens of time, I believe that, in hindsight, that surprise factor will lessen.