need help with lighting groups

picture taker wrote:
wedding groups shots in church after the ceremony i always have light
fall on the corners .

24-70 2.8l exposure 125/4.5 i hate bumbing up the iso but do but still
am not happy doing that .
im using a canond 5d with the quantum t5d-r on a custom bracket .
i shooot raw and have a little room to open them up more but was
thinking about adding another light to get even lighting .
do any of you guys/girls have any experience with this type of
lighting ?
do any of you bring along studio strobes and use them for these shots ?

Use one or more Strobes in Slave mode.
Bob Williams