Canon EOS-1Ds Mark III Suggerimenti e tecniche - Pagina 6

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45-point Area AF Sensor

I. CAMERA FEATURES

AND OPERATION

EOS-1 class digital SLRs use an improved version of the 45-point Area AF CMOS sensor

unit that was originally introduced in 1998 with the EOS-3. The pixel density and layout

of sensor elements together with the patented design of the camera's sub-mirror and

separator lenses gave rise to the name "Area AF" and resulted in a coverage area of 8 x

15mm with 45 selectable focusing points. (Previous EOS AF designs had 5 points or

fewer, all in a single line.) When the camera is oriented horizontally, all 45 points are

sensitive to horizontal or diagonal subject contrast with lenses featuring maximum

apertures as small as f/5.6. Six of the central-area focusing points become high-

precision cross-type sensors when the lens has a maximum aperture of f/2.8 or larger.

The central focusing point is high-precision cross-type with f/4 or faster lenses, and can

maintain single-line autofocus with maximum apertures as small as f/8. These factors

can come into play when choosing lenses and extenders for maximum AF performance.

AF Frame

The focusing area is 8 x 15mm regardless of the camera's imaging format.

Consequently, AF coverage is proportionately larger with the EOS-1D and EOS-1D Mark II

with their 19.1 x 28.7mm imaging format than it is with the EOS-1Ds Mark II, EOS-1Ds,

EOS-1v or EOS-3 which feature 24 x 36mm coverage.

EOS 1Ds Mark II

I. CAMERA FEATURES AND OPERATION

Black: Horizontal line detection

sensors operational with

f/5.6 or faster lens.

Red: Vertical line detection sensors

operational with f/2.8 or

faster lens.

EOS 1D Mark II