I am having a lot of trouble understanding how my flash works with my camera. I currently shoot w/ a canon Rebel XT. I have seldom used the pop up flash. But, recently I purchased the canon 430EX flash.
I generally shoot in Av, Tv, or M modes. But I noticed a difference in exposure setting when using the flash in P mode vs the other modes. For example, in a recent test, when in P mode with the flash on exposure settings were automatically set to 1/60 at f4. Keeping the flash on and metering the same subject in Tv mode with shutter set at 1/60 I get f2.8 flashing (indicating it will be underexposed). Likewise if I got to Av and set to f4 I get a shutter speed of 1/10. In M mode if I set the camera to 1/60 @ f4 I get the light meter saying it will be under exposed (but if I take the shot it looks pretty good). When I take the shot in Tv or Av the photo looks good (although tripod needed for Av).
I am just trying to understand how the camera is metering in these different modes so that I can properly use my flash when needed. I know this is an amature question but I am still learning. I appreciate any insights.
Thank you,
Mike