规定了摄影镜头距离刻度标记的一系列首选值。对于以米和英尺为单位表示距离的刻度，给出了首选值。还指定了无穷大标记。

Specified is a series of preferred values for the distance scale markings of photographic lenses. The preferred values are given for scales indicating the distance in metres and feet. The infinity mark is also specified.