Canon EOS 1V Troubleshooting Guide download pdf (Page 46)

Focusing an Off-Center Subject

AF Sensitivity According to the Lens' Maximum Aperture

The EOS-1V's focusing points are all horizontal-line sensitive. However,

depending on the maximum aperture of the lens, certain focusing points can

achieve higher AF precision.

(1) With lenses whose maximum aperture is f/2.8 or

larger, the focusing points highlighted in the

figure become cross-type sensors sensitive to

both vertical and horizontal lines. The remaining

38 focusing points are horizontal-line sensitive.

The sensor's vertical-line sensitivity is three

times higher than the horizontal-line sensitivity.

With lenses whose maximum aperture is f/3.5 or

darker, all 45 focusing points will be horizontal-

line sensitive except with the L-series lenses

listed in (2) below.

(2) With the following Extenders and L-series

lenses whose maximum aperture is brighter

than f/4, high-precision AF is possible with the

center focusing point working as a cross-type

sensor. The remaining 44 focusing points are

horizontal-line sensitive (except with EF 70-

200mm f/2.8L USM + Extender EF 1.4x).

· EF 28-80mm f/2.8-4L USM

· EF 300mm f/4L USM

· EF 300mm f/4L IS USM

· EF 500mm f/4L IS USM

· EF 600mm f/4L USM

· EF 600mm f/4L IS USM

· EF 70-200mm f/4L USM

• With Extender EF 1.4x:

· EF 200mm f/2.8L USM

· EF 200mm f/2.8L II USM

· EF 300mm f/2.8L USM

· EF 300mm f/2.8L IS USM

· EF 400mm f/2.8L USM

· EF 400mm f/2.8L II USM

· EF 400mm f/2.8L IS USM

• With Extender EF 2.0x:

· EF 135mm f/2L USM

· EF 200mm f/1.8L USM

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Canon EOS 1V Troubleshooting Guide Page 46