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I think there's some sort of light sensitive trigger mechanism that opens the shutter as soon as the light reaches above a certain threshold.
I think.
I love watching lightning. The odd thing is it might be the deadliest thing in nature. It's cool to look at from a distance though.
I've heard that lightning is the same type of electricity that is produced as static electric shock (like when you build up static electricity sitting on carpet and shock your friends) - just on a LARGER scale