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The higher the ISO the brighter the strike, the higher the ISO the grainier the image, the higher ISO the shorter the exposure time. The lower the ISO the strike will be more defined without the washout, the lower the ISO the less noise on the image so if you use a high enough resolution you can blow it up to poster size or a bit bigger, the lower the ISO the longer you can hold the shutter open for those storms that arnt quite that intense in frequency. I tend to keep the ISO low, adjust apature and exposure times to compensate, and use the lightning as the flash! As soon as the strike goes, you stop.
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