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I have an Olympus E-520 and I borrowed a Nikon SB-20 flash which I intend to use as an optical trigger for an off-camera flash (TTL connectors on the flash connector are removed to avoid mixing ttl signals). How do I find out if it's safe to use on my camera?

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Well, the there is a flash trigger voltage overview site that says Nikon SB-20 has a trigger voltage of 5.5V, and that some older Olympus digicams has trigger voltage of 10V, and that Olympus recommends something in 3-6V range. There's a related thread on dpreview forums that suggests that flashes in this range should be okay.

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