Let assume your scenerio and settings are facts. Doesn't matter whether in Av, Tv or M mode, as with this combination you get this exposure issue.
1. If the ambient or background is under and aperture already widest, nothing you can do to the aperture other than changing to a faster lens. The other options are either slow down the shutter or raise ISO.
2. Slowing the shutter will not affect the flash, but as you've mentioned may cause motion blur. So unless subject is relatively in the shadow and the flash can freeze it, this option may be out too.
3. Raise ISO will affect flash. And since flash is already at the lowest power, you can't lower it further. So either have a less powerful flash, diffuser it or bounce it.
Options are always limited when you are at the limits of your equipment.
PS - of course one can use many slave flashes to light the entire scene up too.![]()
i had a similar conclusion as yours
the solution i thought of is to either use a sort of diffuser/soft box to soften the flash and up the iso, no idea if it works tho
not sure if there are other solutions
otherwise, i think it could be a "**** out of luck" situation?
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