I am actually learning flash photography right now but I am using Portrait shots to practice. I have a Nikon D3100 and I am using an SB-700 flash (on the shoe for starters) on a tripod. While I was practicing different flash manipulations to try and soften the light, I found it a real pain the the you know what to focus on the eyes every time (while using a tripod). Since the 3100 only has one higher end sensor (the middle one, I forget the name of it though so I call it the higher end one), I use it on the eyes. Obviously if I took the camera off the tripod, I could use focus lock when the shutter release is halfway down. What do you Portrait people do (other than buy a better camera with many many focus points) when shooting with a tripod?? I can see a model getting really frustrated with all of the "a little to the left, or now down, no up a little" commands being dished out.