Canon EOS EOS-1D Guía para resolver problemas descargar pdf (Pagina 71)

Using Autofocus (AF)

AF Sensitivity and the Lens’ Maximum Aperture

The EOS-1D’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 faster

(lower f/number), the AF points highlighted in the illustration

will be 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 three times higher than the horizontal-line

sensitivity.

(2) With the following L-series lenses whose maximum

aperture is brighter than f/4 by lens only or with Extenders,

the center AF point will be a cross-type sensor for high-

precision AF. The remaining 44 focusing points will only be

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 400mm f/4 DO 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 or EF 1.4x II:

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

EF 70-200mm f/2.8L IS USM

•

With Extender EF 2x or EF 2x II:

EF 135mm f/2L USM

EF 200mm f/1.8L USM

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Canon EOS EOS-1D Guía para resolver problemas Pagina 71