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.
你還需要根據風暴的位置遠近設置好適度的快門速度和光圈值。
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.
如果你更經常在夜晚，室內，以及低光環境中拍攝的話，考慮相機的ISO-（與膠片相機的膠片感光度相同）範圍設置。我日常使用的相機最高感光度爲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.
你要根據風暴的現狀找到自己的最佳位置，設置蓡數，選擇正確的膠片速度和曝光值，打開快門等著第一道閃電的降臨。

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