This paper attempts to follow logics expounded in Jonathan Crary's book ”Techniques of the Observer” continue research category of this book and expand field of vision into movies of the end of 19th century and video media of mid-20th century. From perspective of titles such as photography, movie and video, the author frames and sets a research field and time definition by virtue of various visual-representation equipment; at the same time, changes in development of all key media of this field are also involved. However, this paper doesn't just investigate development history of tools but emphasizes influences on and changes in ”creators and observers' mode of viewing dynamic and static images” as well as ”their thinking mode”.