标准摘要
[中文适用范围]： 本国际标准规定了胶片相机焦平面上的曝光的两个曝光参数值，即场亮度和胶片速度，并且还描述了评估其他光度特性（例如光电系统的接受角）的方法。 本国际标准适用于内置于胶片相机或与其结合的自动曝光控制系统，以根据多个曝光参数调节焦平面中的曝光。 该机制可以控制焦平面照度或曝光时间间隔或两者。 指针（或针）匹配系统包含在本国际标准中，尽管它们不是全自动的。 本标准不适用于数码相机。 [外文原描述]： ISO 2721:2013 specifies the exposure at the focal plane of film-based cameras for values of two exposure parameters, i.e. field luminance and film speed, and also describes methods of evaluating other photometric characteristics, such as the acceptance angles of the photoelectric system. ISO 2721:2013 applies to automatic exposure control systems which are built into film-based cameras or coupled with them to regulate the exposure in the focal plane as a function of the several exposure parameters.
英文名称Photography — Film-based cameras — Automatic controls of exposure