Help with flash features

Started Nov 21, 2005 | Discussions thread
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byawk Regular Member • Posts: 226
Help with flash features

I own the 300D and the 550EX. I've recently been perusing the manual for the 550EX, trying to understand all its features. I've managed to comprehend most of it, but there are two things I am still having trouble understanding.

What is the high-speed sync feature? What is it useful for?

What is the second-curtain synchronization? When I tried it, the flash fired twice -- once when I pressed the shutter and once when the shutter closed.

I was just wondering if anybody out there had down-to-earth explanations for these features. I've read and re-read the manual, but it just hasn't clicked in my head yet. Any help would be appreciated.

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