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| p.1 #5 · Central AF point size |
I found something interesting here:
Canon EOS Digital Rebel XTi (400D), Rebel XSi (450D), Rebel T1i (500D), Rebel T2i (550D), Rebel T3i (600D), 20D, 30D
The center point is high-precision only when the aperture is at least f/2.8. If below f/2.8 but at least f/5.6, all points function as either horizontal or vertical sensitive only, except for the center point, which functions as standard-precision cross-type. Below f/5.6, autofocus does not function.
Canon EOS 6D
The center point is high-precision cross-type only when the aperture is at least f/2.8; the other points are either horizontal or vertical sensitive (not both). If below f/2.8 but at least f/5.6, the center point remains cross-type but is normal precision only; all other points continue to function normally. Below f/5.6, autofocus does not function.
Kinda' same thing...