Canon EOS 1 V HS - Manual (Page 46)

Focusing an Off-Center Subject
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^ AF Sensitivity According to the Lens' Maximum Aperture
The EOS-1 Vs 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 horizontai lines. The rernainirig
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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