That makes sense. I had noticed that with a 200 f/2.8 (2.82) and the 1.4x PS shows f/4 (3.999~) did the right thing. 300 f/4 (3.999~) and the 1.4x f/5.56 (5.56585), did the right thing. I do use center focus point most of the time on both the 30D and the 5D. Does the camera care that much (5.7)?


Thanks for the information,


JeffersonPoster