I also, quite often, would close my shutter at the
slightest flash, and would not get the whole impressive
display of the lightning.
Since the shutter is held open, just like any other camera,
the longer it's open, the more light it will absorb. With some
of the lightning that would flash and dance around the sky, I
found it very easy to over-saturate the CCD element of the
camera, and the shot would just come out white. So I have
gotten into the habit of immediately closing the shutter upon
first detecting the flash. It seems to give me better results,
overall.
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