• Ok, so do I pre-focus (manual focus?) on the eyes and leave it set until the model changed position? But if the model is dancing around, she will be in & out of focus, so what do I do then?
  • I am willing to up the ISO to 200, but I feel 400 has been too noisy for me unless there is lots to fill the image. Tho I will try a few shots at 400.
  • The diffraction on the XTi is f/9.3. If I am looking for crisp headshots, shouldn't I keep the aperature at f/9 or less?
  • A question about AF sensors. If I am shooting w/ a f/2.8 lens at f/8 w/ a DOF of 0.57' at 8 feet, how much better is the focus accuracy? I get that with a slower lens it could be +/- 0.28', is it within a 0.1' or is there some formula I can use? I do have 4 lenses at 2.8 or better, I just can't afford to have a longer lens faster than 4.0.



Thanks for all your comments and suggestions, I will post a few pictures later tonight or tomorrow.


Harold