本文件为确定静止摄像机中使用的所有类型快门的曝光时间提供了统一的基础，并包含了所用术语的适当定义。 它规定了所有类型百叶窗的曝光时间标记及其公差。 还定义了安装在静止摄像机中的所有类型机械快门的特性，这些机械快门影响曝光控制、运动停止能力以及与闪光灯光源的同步。 指定的公差是快门性能的目标值，预计会产生良好的结果。由于公差可能随被测相机的特性和价格等级而变化，因此它们不适用于作为控制机械快门性能的一般检查标准。 描述了常规制造测试和质量控制的测试方法。这些测试方法需要接近相机的焦平面，因此不能应用于组装的数码相机。

This document provides a uniform basis for determining the exposure times for all types of shutters used in still cameras and contains suitable definitions of the terms used. It specifies the exposure-time markings for all types of shutters and their tolerances. The characteristics of all types of mechanical shutters, which are mounted in still cameras and affect the control of exposure, motion-stopping ability and synchronization with a photoflash light source are also defined. The tolerances specified are the target values for the shutter performance that can be expected to give good results. They are not intended for application as a general inspection standard in controlling the performance of mechanical shutters, since tolerances may vary with the feature and price class of camera tested. Test methods are described for routine manufacturing testing and quality control. These test methods require access to the focal plane of the camera and can therefore not be applied to assembled digital still cameras.