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Leon,
Working in power stations with many sensitive electronic items & often large chimney stacks, the biggest danger we find is not so much induced energy, rather transfer of potential from something near the discharge source and the equipment away from the discharge point (eg water pipes, fencing, power supplies with a solid earth reference etc). For camera equipment not connected to a remote device physically (ie cable) the risk is very minimal unless you're literally right near it (< say 20 to 50 metres).
This photo was taken approx 400m from where it hit a building with a 40D and I just have to say I was very lucky to be pointing in the right direction at the right time (ISO 200, 1sec, F8, manually prefocused).
Good luck - I would love to do this sort of thing if I ever get time!!
Darrin...
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