Canon EOS-1D Mark II Digial Suggerimenti e tecniche - Pagina 20

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Background

Both AFPS and Single Point AF are useful in shooting sports. A single point is generally

best in team sports like football, basketball, soccer, and hockey. AFPS is good for sports

like baseball, some track and field, and many individual sports like skiing, skating, etc.

AFPS is also useful in team sports like football or soccer where the player has broken

free of a large pack and the main scene is composed of only one or two players.

Like sports, wildlife photography has situations where different focusing methods are

helpful. AFPS for birds in flight, single running animals in the open; and Single Point AF

for birds in a tree or nest, or animals lurking in woods or tall plants.

The idea here is that the photographer can make that call on-the-fly while shooting,

rather than trying to anticipate prior to bringing the camera to the eye what method

would be best.

Most sports shooters prefer to use a rear button on the camera for focusing rather

than using the shutter in its halfway position. There are several advantages to working

this way.

• The photographer can capture focus on the subject well in advance of shooting the

image without worrying about pre-metering or accidentally firing a shot.

• The camera can stay in focus on a single subject for longer periods of time (e.g.,

waiting for a batter to swing) and when ready, the photographer can shoot with better

camera responsiveness.

• While pressing the AE Lock button in this mode, you have AI Servo tracking focus. Let

go of the button and you are now locked at that distance (as if you were in One-Shot).

And with Canon EF lenses that have Full-Time Manual focusing, including all USM

lenses with distance scales, you now have manual focus... all three focusing options

available without having to take your eye from the finder.

Operation

Assign AFPS as your Home Position (HP). Then go back and set any single or double

focusing point with the AF Point Selection Button. Most photographers would probably

set the center point depending on what they're shooting, but any focusing point can be

selected if it's compositionally more pleasing.

Now you have two buttons on the back of the camera that activate focus. When you look

into the finder you will see the single or double AF point you've chosen. Hold in the AE

Lock (*) button with your thumb and the camera will servo focus at that point. Or, hold

in the Assist Button and the camera will servo focus using AFPS (see information on

AFPS with AI Servo earlier in this document). Or, focus the lens manually at any time.

In this way, you can choose, while looking at your subject through the viewfinder, which

method is more effective or appropriate to that subject without the distraction of taking

your eye off the subject.

I. CAMERA FEATURES AND OPERATION