I use a 550 EX, and from somewhere in the distant past, I recall reading or hearing that it is best to fire a flash unit, then IMMEDIATELY turn it off, rather than turning it off while fully powered up. Something about it is better for the internal electrics of the flash, or something along those lines. I have turned my flash off like this for many years.... just wondering if *I* am the only one doing this, or if it is even necessary? Steve
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