But as the science and technology of photography have constantly evolved over the approximately two hundred years of its development , a continual revolution has been underway , the various stages of which can be marked by the emergence of traditional roll - film cameras , the polaroid , fully automated cameras point - and - shoot cameras as well as the digital camera and camera phones 通过镜头，不同年代的各种面貌得以客观地保留。经过近二百年的发展，科学技术日新月异。从传统菲林相机宝丽来全自动相机傻瓜机到数码相机以及手机摄影的出现，使革命不断地延续下去。
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