Sony PICTURE STATION DPP-FP90 브로셔 및 사양 - 페이지 19

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Taking your best shot

CAMERA CONTROL

Focus

Sony focus

features

With all but the most basic cameras, image

sharpness depends on adjusting the lens

according to the distance to the subject. This,

Taking advantage of the BIONZ

circuit, Sony cameras accurately recognize

of course, is focus.

– and focus on – the human face.

During manual focus, you can consult

the image in the LCD monitor, electronic

viewfinder or through-the-lens optical

BIONZ

™

processor solves this problem with

viewfinder. You then adjust the focus until

Face Detection. As you shoot, the Face

the subject is clear. On auto focus cameras,

Detection function actually analyzes the

you can simply point and shoot.

data that make up your digital picture. In

this way, Face Detection can identify and

Typical auto focus (AF) systems detect the

track up to eight faces at a time. Then the

picture information coming off the image

camera automatically adjusts for optimum

sensor. When contrast in the image is highest,

focus, exposure, flash and even white balance

the subject is in focus. When contrast is low,

on the faces themselves. The result is far more

the image is out of focus. In this way, AF

"good" pictures, far fewer rejects and re-takes.

systems can work quickly and automatically.

AF systems generally work quite well.

But they can be thrown off by some

tricky circumstances.

• The challenge of darkness.

Unfortunately, auto focus can run

into trouble in low light, when the

camera can't "see" contrast coming

off the image sensor.

• The challenge of composition.

Sony solves common focus problems with Face Detection technology. (Sample photos for illustration purposes.)

Most AF systems look towards the

center of the frame. Unfortunately, if

your subject is away from the center,

the camera could well be focusing

on the wrong thing.

• The challenge of subject motion.

If you're shooting kids, pets or sports,

your subject can unexpectedly move

toward or away from the camera. This

means the camera-to-subject distance

is changing from moment to moment –

another challenge for AF systems.

For these reasons, Sony has developed

an array of powerful features for focus

While conventional focus (left) becomes very hit-or-miss in low light, our AF Illuminator (right) is right on target. (Sample

illumination, processing and control.

photos for illustration purposes.)

For the complete story on Face Detection

and the BIONZ processor, please turn to

page 26.

AF Illuminator

Face Detection

Accurate focusing, even in low light.

™

integrated

Auto focus can run into trouble in low light,

when the camera can't "see" contrast coming

off the image sensor. That's why Sony offers

Even a simple snapshot can trip

AF Illuminator. The camera throws a special

up the automatic focus on a

light on the subject prior to the shot, so the

conventional camera. Sony's

camera can "see" the subject's contrast. You

get accurate focusing, even in low light.

Multi-Point Auto Focus

Automatically finds the focus, even when

your subject isn't in the center of the frame.

INCORRECT FOCUS

CORRECT FOCUS

CAMERA CONTROL

If the subject is off-center, cameras with a single focus point (left) tend to focus on the background. Sony Multi-Point AF (right) automatically brings the subjects into focus. (Sample

photos for illustration purposes.)

With the Flexible Spot AF of the DSC-H7, H9, and N2, you can frame the shot first, then

use the camera controls to select the focus point. (Sample photo for illustration purposes.)

Simple cameras simply focus on whatever is

To accommodate the full range of shooting

in the middle of the frame. But when you're

situations, Multi-Point AF also includes

taking a picture of two people, the center

switchable modes like Center AF, which

of the frame often shows the background –

uses only the center area, Spot AF,

the wrong place to focus! In other cases,

which uses only a tiny spot and Focus

you'll get a more creative shot when the

Lock, which enables you to focus first, and

subject is off center. For these reasons,

then frame the shot any way you want.

Sony developed Multi-Point Auto Focus.

Some Sony cameras use a five-point system,

Advanced Sports Shooting

automatically selecting the right focus

Mode Auto Focus

points based on your composition. Cameras

equipped with the BIONZ

™

processor use

Predictive auto focus knows not only

a nine-point system. So you get critically

where your little soccer player is,

accurate focusing under a wider range

but where she's going.

of conditions.

To keep up with fast action, the DSC-H7

and H9 15x zoom cameras incorporate a

special version of Continuous AF (discussed

in the Selectable AF section below). Instead

of simply "keeping up" with your moving

subject, the camera actually predicts where

the subject will go in the interval between

shutter release and image capture. This can

be a key advantage in sports, especially if

the subject is moving towards you.

A super-fast 1/4000 second shutter speed

helps to freeze the action on even the

fastest midfielder.

Selectable AF

Perfect for unpredictable sports and fast-

moving subjects, because you can choose

a more responsive focus mode.

Single Shot Auto Focus "locks" onto the

subject as soon as you press the shutter

half-way, which can be a problem when

there's plenty of relative motion between

the subject and the camera.

• Single Shot AF is ideal for subjects

that are standing still. The Auto Focus

process doesn't begin until you press

the shutter halfway.

• Monitor AF speeds the shot, an

important advantage in sports

Continued on page 36.