Focusing an Off-Center Subject
46
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
SEC.03 P033-048 (E) 28-01-2003 16:04 Pagina 46
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