1 (a:b)] multiple slave units in multiple groups, Set [firing group] to [ 1 (a:b), Set the desired flash ratio and shoot – Canon EOS 7D User Manual

1 (a:b)] multiple slave units in multiple groups, Set [firing group] to [ 1 (a:b), Set the desired flash ratio and shoot | Canon EOS 7D User Manual | Page 128 / 292