> > How do you do this and not end up with underexposed backgrounds? I would
> > like to do this because I often find the shutter speeds to be to slow
> > when I use AV. But, I am concerned that if I set the f/stop and shutter
> > speed myself I will end up with underexposed backgrounds.
> >
> > Gary
> >
>
>You'll have to live with it. When you set the aperture (AV) you have to
>choose between a dark background or a slow shutter speed. The slow
>shutter speed is needed to correctly expose the background, if you cut
>down the shutter speed, underexposure is unavoidable. There's nothing
>you can do about it short of an extra flash unit (or several of them)
>for the background.
>
>Thomas Bantel
In case of e.g. wedding (when shooting in the tables) one possibility
could be to have one 550EX in camera and an assistant with a slave
550EX in his hand. Now when you move he looks where you point the
camera and runs with the slave flash to a good position to illuminate
the backgroung. Some pre-planning might help (him/her).
Or you could have two flashes in your camera, one straight (just to
be sure to get the photo) and the other one either:
- reflected from the ceiling or
- pointing straight but just a bit higher than the primary flash
possibly in tele setting so that it would mostly illuminate the
background and not much the foreground.
To be perfect the camera should know where each flash is pointing
so it could adjust each flash output independently.
Never tried either method though... ;-)
Actually the last one might be useful to try. Now I just need
to get two TTL-flashes. :-|
Vesa
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