Canon EOS-1D C EOS 1D X Instruction Manual - Page 82
AF when the maximum aperture is f/8
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Lenses and Usable AF Points AF when the maximum aperture is f/8 When an extender is attached to the lens, AF is possible even when the maximum aperture value is larger than f/5.6 up to f/8. Selectable AF area selection modes are the same as that of group H (p.81). EF400mm f/5.6L USM + Extender EF1.4x EF500mm f/4.5L USM + Extender EF1.4x EF800mm f/5.6L IS USM + Extender EF1.4x EF1200mm f/5.6L USM + Extender EF1.4x EF300mm f/4L USM + Extender EF2x EF300mm f/4L IS USM + Extender EF2x EF400mm f/4 DO IS USM + Extender EF2x EF500mm f/4L IS USM + Extender EF2x EF500mm f/4L IS II USM + Extender EF2x EF600mm f/4L USM + Extender EF2x EF600mm f/4L IS USM + Extender EF2x EF600mm f/4L IS II USM + Extender EF2x EF70-200mm f/4L USM + Extender EF2x EF70-200mm f/4L IS USM + Extender EF2x EF100-400mm f/4.5-5.6L IS USM + Extender EF1.4x If the maximum aperture is smaller than f/5.6 (the maximum aperture value is larger than f/5.6 up to f/8), focus may not be achieved with AF when shooting low-contrast or low-light subjects. When Extender EF2x is attached to the EF180mm f/3.5L Macro USM lens, AF is not possible. If the maximum aperture is smaller than f/8 (the maximum aperture value exceeds f/8), AF is not possible during viewfinder shooting. Also, AF is not possible with f during Live View shooting and movie shooting. 82
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