Rob, you've brought up a very good point, regardless of which camera, lens, or focusing mechanism is used. It bears repeating, and not only for users of wide aperture lenses (F/.075 through, say, f1.8). Even slower glass can sometimes have the problem. The oft heard suggestion of "focus and recompose" is not always the best approach.
Shel > [Original Message] > From: Rob Studdert > Frank, this is why I love my full matt screens in the LX, because I'm not > dragged to the centre of the screen to set focus. Many fast lenses and the > 50/1.2 in particular focus over a spherical FOV. So if you set the focus in the > screen centre then move to re-compose the combination of the very limited DOF > at wide apertures and the non-planar focus field may very well let you down > like you discovered.
