to illustrate the aperture light bending effects of your image plane to be shifted after your focal plane has been set:
1) AF sensor(s) read the default optical plane for AF. Using the above GUI to see your f1.4 optical plane at wideopen and remember your focus plane position.
2) Let say you want to shoot at f2 and use off center AF for your shot. Using the above GUI to see your f2 optical plane position. This optical plane position is your final image
3) Compare your focus point from last two optical planes (f1.4 and f2) to see why your image is in backfocus
Who to blame now: Lens or Body...i would say the BODY. Some bodies have on-board fast lense database to offset the bending effects, but most don\'t and we do have a long list of canon fast lenses from 14 to 50mm.
Nov 29, 2012 at 07:03 PM
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