I recently got a 7D and have a few flash questions.
1) Does the 7D and 430EX and 550EX fully integrate with the 7D? The reason I ask is that I can't get to the flash custom functions when the camera is on, or off the hotshoe. Also, when the camera is off the hotshoe, I am unable to even see the settings for either of the above flashes.
2) With this combination, it looks like the only thing that triggers the flash is the flash of the 7D actually going off itself. Isn't this more like the ST-E2 using some sort of red light to communicate? Apparently this sort of thing works regardless of what E-TTL flash you are using.
3) What does it mean when the display on the 550EX is flashing?