AF Sensitivity and the Lens' Maximum Aperture
(3)With the following Extenders and L-series lenses whose maximum aperture is faster than f/8, the center AF point will be horizontal-line sensitive only. The other AF points cannot be used for AF.
•With Extender EF 1.4x or EF 1.4x II: EF 400mm f/5.6L USM
EF 500mm f/4.5L USM
EF 100-400mm f/4.5-5.6L IS USM
•With Extender EF 2x or EF 2x II: EF 300mm f/4 L USM
EF 300mm f/4L IS USM EF 400mm f/4 DO IS USM EF 500mm f/4L IS USM EF 600mm f/4L USM
EF 600mm f/4L IS USM EF 70-200mm f/4L IS USM
• When the <
> button is pressed, the display shown on the right will appear on the top LCD panel.
The EF 70-200mm f/2.8L USM lens (without IS) used together with Extender EF 1.4x or EF 1.4x II will enable the center AF point to work as a cross-type sensor. However, do not autofocus with the other AF points because they may cause a focusing error.
