I'm trying to do take some portraits with two off-camera strobes. I want a dark background, so I'm using a high f-stop and high ISO to kill the ambient, relying on the strobes to light the model.
But in this situation the viewfinder goes dark and the AF stops working and it's too dark to manually focus.
Models are my children (who won't sit still:-), so I can't really 'pre-focus'.
Gear: EOS-M, 70-300mm 4-5.6, 550EX & YN-560