Canon EOS-1Ds Mark III Conceção e desempenho - Página 9

Procurar online ou descarregar pdf Conceção e desempenho para Software Canon EOS-1Ds Mark III. Canon EOS-1Ds Mark III 25 páginas. Digital slr camera
Também para Canon EOS-1Ds Mark III: Manual de instruções (42 páginas), Livro Branco (38 páginas), Manual de instruções (19 páginas), Dicas e técnicas (35 páginas), Manual do produto (39 páginas), Manual do produto (36 páginas), Manual do utilizador do software (50 páginas), Brochura (39 páginas), Manual (25 páginas), Brochura (2 páginas), Brochura (32 páginas), Manual de funções (21 páginas), Especificações (2 páginas)

shooting speed of 4 frames-per-second despite the enormous file size generated by

16.7 megapixels.

The EOS-1Ds Mark II's sensor measures 36 by 24mm, a full 35mm frame, eliminating the

need for lens focal length conversion factors. Wide-angle lenses and the many unusual

or specialized lenses in the Canon EF family have their full, unfettered visual effect.

Autofocus System

The EOS-1Ds Mark II uses the exceptionally precise and fast autofocus system of the

EOS-1D Mark II with a few minor changes.

Viewfinder

up to a maximum aperture of f/5.6. The central AF point is a cross-type sensor that

supports vertical-line sensitivity to a maximum aperture of f/4 and horizontal-line

sensitivity to a maximum aperture of f/8.

There are three autofocus modes: One-Shot AF, which stops and locks when focus

is achieved, Predictive AI Servo AF, which constantly tracks subject movement and

focuses until the start of exposure, and Manual focusing, which has focus

confirmation with the in-focus indicator light and the superimposed AF point.

EOS Speedlites that have built-in AF-assist emit a near-infrared beam when

necessary to assist autofocus.

The AF-related circuitry and the AF algorithm in the 1Ds Mark II incorporate the new

1D Mark II design so that the AF performance clearly surpasses that of the 1Ds.

The EOS-1D and 1Ds had a single CPU for AF operations from focus detection to

lens-driving control. The EOS-1D Mark II and 1Ds Mark II have two CPUs responsible for

these functions.

Dividing tasks means decisions are made simultaneously rather than in sequence. In

Predictive AI Servo AF, statistical prediction using the focusing data from previous

focusing operations is incorporated. The number of focusing operations per unit time is

twice as many with the 1D and 1Ds. With shorter time intervals and more repetitive

focusing operations, the predictive AF control works effectively from the first shot even

with subjects moving erratically. Should the subject's movement change just before

shutter release, the shorter focusing operation interval means the predictive AF control

has a higher probability of catching it.

III. NEW AND IMPROVED DESIGN FEATURES

Like the EOS-1D Mark II, 1D, 1Ds and 1v, the

EOS-1Ds Mark II has a 45-point Area AF unit.

Manual selection of 45, 11 or 9 AF points is

possible. 38 of the 45 AF points are

vertical-line sensitive up to a maximum

aperture of f/5.6. 6 of the 7 AF points at the

center are cross-type sensors that are

vertical-line sensitive up to a maximum

aperture of f/2.8 and horizontal-line sensitive