Canon EOS-1Ds Mark III Советы и техника - Страница 7

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The Evolution of AF Speed

& Predictive AF Control

The EOS-1D and EOS-1Ds had the fastest AF systems available among EOS SLRs when

they were introduced, but the EOS-1D Mark II now has the most powerful AF system of

any EOS camera released to date (2004). The EOS-1D Mark II was the first Canon camera

to feature two dedicated CPUs for AF: one for detection and calculation, and another to

control lens drive. EOS-1 class cameras prior to the 1D Mark II used a single dedicated

CPU for all AF operations.

All EOS-1 class digital SLRs feature RISC (Reduced Instruction Set Computing)

processors so that multiple operations can be performed simultaneously. The extra

speed created through this method has made it possible to increase the power and

sophistication of the algorithms employed for predictive AF. Using an EF 300mm f/2.8L

IS USM lens and a fully charged battery pack, the original EOS-1 with Power Drive

Booster PB-E1 could track a subject moving at 300 kph/186 mph as close as 26

meters/85 ft. Using an EF 300mm f/2.8L IS USM lens and a fully charged battery pack,

an EOS-1D Mark II or EOS-1Ds Mark II can track a subject moving at 300 kph/186 mph

as close as 20 meters/66 ft.

Predictive AI Servo AF Performance

How close can the camera track a moving subject with an EF300mm f/2.8L IS Lens

5km/h

30m

20m

10m

3mph

Subject Speed

EOS-1: 5 fps

(with Power Drive Booster E1)

I. CAMERA FEATURES AND OPERATION

100

200

300

125

185

EOS-1D Mark II: 8.5 fps

400km/h

98 feet

66 feet

33 feet

20 feet

10 feet

6 feet

250mph