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本文论述了基本摄影物镜在电影摄影物镜系列中的地位，指出 电影影像透视的记录与再现质量是电影画面构图与银幕影像质量的重要组成部 分。本文阐明了确定基本摄影物镜焦距值的计算方法及其理论依据，并用此方法对 ３５ｍｍ、１６ｍｍ常规电影和７０ｍｍ巨幅电影分别进行了计算。所得结果表明：（１）对 于３５ｍｍ、１６ｍｍ常规电影，基本摄影物镜焦距值与现行定义所确定的标准摄影物 镜焦距值完全一致；（２）对于７０ｍｍ巨幅电影，基本摄影物镜焦距值与按现行定义 所确定的标准摄影物镜焦距值有明显差异，由此得出标准摄影物镜的现行定义只 适用于３５ｍｍ、１６ｍｍ常规电影，并不适用于７０ｍｍ巨幅电影的结论。文章最后对 ７０ｍｍ巨幅电影的画面构图特点作了进一步的分析与讨论。本文是对文［２］的补充 与深化。
This paper discusses the position of basic photographic objective in the series of film photography objective and points out that the quality of recording and reproduction of movie image perspective is an important part of the film composition and screen image quality. This paper clarifies the calculation method and theoretical basis for determining the focal length of the basic photographic objective, and uses this method to calculate the 35mm, 16mm conventional film and 70mm giant film respectively. The results show that: (1) for 35mm, 16mm conventional film, the basic photographic objective focal length and the current definition of standard photographic objective focal length determined exactly the same; (2) for 70mm huge movie, the basic photographic objective focal length value and the current The definition of the standard photographic objective lens focal length values were significantly different, which concluded that the current definition of standard photographic objective lens is only applicable to 35mm, 16mm conventional film, does not apply to 70mm huge movie conclusion. At the end of the article, the composition characteristics of 70mm huge movie are further analyzed and discussed. This article is the complement and deepen the article [2].