Evrim,
you have already got good advice but here is some more even
if you already might have thought of it:
I assume here that the ambient light is too low so that
more sensitive film or faster lens is not an option.
If the flash-subject distance is half of the flash-background
distance then the background will be two stops underexposed.
As you know, always when you double the distance from a flash
it will cause two more stops underexposure.
So in your case I would keep the subject closer to the
background than to the camera. You may want to move further
away and use longer focal lengths in some case (but that is not
compulsory since you can crop as long as the quality remains good
enough for you; did you mention what type of film you are using?).
You may also need more flash power.
It also depends a lot of how light or dark the surface of the
subject (e.g. white shirt) and the background (dark walls)
is.
Hope this gives some ideas.
Vesa,
just back from holiday (part 1).
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