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I don't use the flash much, and I'm finding myself unable to figure out what might end up being elementary knowledge to most of you. I have a 50D and a 5D (classic). The flash is 430EX.
When I use the flash with the 50D in Av mode and the flash in E-TTL mode, regardless of what aperture I select, the shutter speed is 1/250. Which is exactly what I want. Now, I put the flash on my 5D, and the shutter speed automatically selected by the camera in Av mode varies depending on ambient light. It's as though the camera does not recognize that the flash is mounted, even though the flash symbol appears in the viewfinder. Photos taken thus are over-exposed due to the slow shutter speed + flash. To get the shutter speed up, I set the camera to Tv mode and manually set it to 1/250. The aperture then falls to the maximum (say 2.0) and starts flashing, as one would expect for the available ambient light. Having said that, the photos I take in this way are fine. Can someone please explain what's going on? In Av mode, how do I get the camera to automatically select a shutter speed of 1/250?