film speed

基本解释

You also need to set the proper film speed and aperture. This will all depend on location of the storm.
你还需要根据风暴的位置远近设置好适度的快门速度和光圈值。
If you typically shoot at night, indoors, or in dimly lit environments consider the ISO range on the camera - the digital equivalent of film speed.
如果你更经常在夜晚，室内，以及低光环境中拍摄的话，考虑相机的ISO-（与胶片相机的胶片感光度相同）范围设置。我日常使用的相机最高感光度为1600。
You’re going to find your spot, set up, select the correct film speed and aperture for the type of storm, open the shutter and wait for the first lightning strike.
你要根据风暴的现状找到自己的最佳位置，设置参数，选择正确的胶片速度和曝光值，打开快门等着第一道闪电的降临。

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the sensitivity to light of a photographic film, specified in terms of the film's ISO rating