OK, so this is not a great picture. But what if I told you that the Canon 580EX was triggered wirelessly by the built-in flash of the camera at a flash ratio of 2:1 and the flash compensation was also set by the camera at -1? For one thing, you’d know that the camera was the new Canon 7D (because the Nikons can’t trigger the 580EX!).
One of the more intriguing features of the 7D is this ability to control an external flash via its own small built-in popup flash. This was a strong selling point to me and I’m tinkering with it to learn the system. Here’s a link to an ongoing discussion and FAQ about the 7D flash.
About all I can personally say about the 7D flash system at this point is that mine works with my Canon 580EX and 420EX flashes – individually or together. I’ll also gripe a bit that the wireless flash control menus are awkward to access repeatedly while learning the system. Here’s hoping that I’ve overlooked a simple shortcut.