Canon 0304B001 User Manual - Page 87
AF Sensitivity and Lens' Maximum Aperture - lenses
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AF Sensitivity and Lens' Maximum Aperture The EOS-1D Mark II N's AF points are all horizontal-line sensitive. However, bright lenses with a large maximum aperture enable certain AF points to work as cross-type sensors for higher AF precision. (1) With lenses whose maximum aperture is f/2.8 or larger, the AF points highlighted in the diagram will work as cross-type sensors sensitive to both vertical and horizontal lines. The remaining 38 AF points will only be horizontal-line sensitive. The cross-type sensor's vertical-line sensitivity is about three times higher than its horizontal-line sensitivity. (2) With the following L-series lenses whose maximum aperture is f/4 or larger, the center AF point will be a cross-type sensor with or without an Extender attached. The remaining 44 AF points will only be horizontal-line sensitive (except with EF70-200mm f/2.8L USM + Extender EF1.4x or EF1.4x ll). · EF17-40mm f/4L USM · EF28-80mm f/2.8-4L USM · EF300mm f/4L USM · EF300mm f/4L IS USM · EF400mm f/4 DO IS USM · EF500mm f/4L IS USM · EF600mm f/4L USM · EF600mm f/4L IS USM · EF70-200mm f/4 L USM With Extender EF1.4x or EF1.4x II: · EF200mm f/2.8L USM · EF200mm f/2.8L II USM · EF300mm f/2.8L USM · EF300mm f/2.8L IS USM · EF400mm f/2.8L USM · EF400mm f/2.8L II USM · EF400mm f/2.8L IS USM · EF70-200mm f/2.8L IS USM With Extender EF2x or EF2x II: · EF135mm f/2L USM · EF200mm f/1.8L USM 87