esxposure correction and flash metering

[pierre_bize]

I do take a lot of picture with flash, especially in daylight, and

like my background to be slightly underexposed. The problem is I'm

not sure if the exposure compensation influences the flash metering

or not. For example if I want the background to be -1 stop and the

flash exposure to be -1/3 should I set the flash exposure correction

on -1/3 or on + 2/3... Hope someone gets my point (I knomw my

question sound kind of confused)

Thanks for help. Pierre.

[primoz]

When you are in Av, Tv or Manual mode your camera will be mettering only ambient light. So when you want background (and in this case also foreground) to be -1 stop you set exposure compensation to -1 and then flash to -1/3. That's pretty much it. For P mode I'm not really sure what it will do.

[mark u]

The best thing to do is to read N K Guy's excellent treatise on EOS flash at

 

http://photonotes.org/articles/eos-flash/

 

This explains the different situations you may encounter, which vary according to the body you have.