Canon EOS-1D Mark IV Брошюра - Страница 15

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EF LENS TECHNOLOGY

Great images start with great lenses and, in many ways, an SLR is defined by the quality,

breadth and scope of its associated system of lenses. For many, Canon EF series lenses

alone are reason enough to choose the EOS System. A blend of some of the world's most

advanced optical, microelectronic, and precision manufac-

turing technologies, EF lenses are perfected in Canon's

laboratories and proven in the field. Whatever you

shoot, whatever your budget, there are Canon

EF lenses perfect for your needs.

Optical Image Stabilizer

Canon Optical Image Stabilizer technology makes

handheld photography more practical at slow

shutter speeds, accommodating more low-light

shooting situations than ever before. Camera

shake typically occurs at shutter speeds less

than 1/ [focal length], resulting in image blur.

Canon Optical Image Stabilizer technology uses

miniature sensors and a high-speed microcom-

puter built into the lens. The sensors analyze

vibrations and apply correction via a special

stabilizing lens group that shifts the image

parallel to the focal plane. Motion blur is

©Arthur Morris

Image Stabilizer OFF

Image Stabilizer ON

canceled, resulting in a sharper image. With Optical

Image Stabilization, it's like gaining up to four stops.

Canon Optical Image Stabilizer technology is built

into many EF or EF-S lenses and outperforms in-

camera stabilization technologies found in other

cameras by allowing for more movement of the

stabilizing lens group. Especially with telephoto

lenses, as the lens focal length increases, the effect

of shake and the degree of correction needed to

cancel it increase as well. With the Optical Image

Stabilizer in the lens, Canon can equip each IS lens

with a stabilization unit optimized for the focal

lengths and optical characteristics unique to that

lens Other systems are limited by how far they can

move an image sensor, and as a result their stabi-

lization is less effective as telephoto lengths get

longer. Also, the result of Optical Image

Stabilization can be seen right in the viewfinder—

impossible with some other stabilizer systems.

Image Stabilization: It Belongs In the Lens

Because every lens is different, different lenses

have different Optical Image Stabilizer needs.

• Reduces motion blur by counteracting camera shake during handheld photography

• With Optical Image Stabilizer in the lens, Canon can equip each Optical Image Stabilizer lens with the

stabilizer it needs

• Found on some telephoto lenses, Optical Image Stabilizer Mode 2 is especially effective when doing

panned shots

• With Canon Optical Image Stabilizer, the effects of the stabilization can be seen in the viewfinder—the

image is steadier, making composition more accurate

How the Image Stabilizer Works — The Optical Image

Stabilizer shifts a lens group in parallel to the focal plane.

When the lens jerks due to camera shake, the light rays

from the subject are bent relative to the optical axis, result-

ing in a blurred image. Camera shake is detected by two

gyro sensors (one each for the yaw and pitch). The gyro

sensors detect the angle and speed of the camera shake

caused by handheld shooting. By moving select lens

elements according to how the entire lens is being shaken,

the image passing through the lens can be steady and

sharp when it hits the imaging sensor. The figure on the

right shows what happens when the lens is jerked down-

ward. The center of the image moves downward on the

image shake occurs in both the horizontal and vertical

focal plane. When the Optical Image Stabilizer lens group

directions, the Optical Image Stabilizer lens group can shift

shifts downward, the light rays are refracted so that the

vertically and horizontally on a plane perpendicular to the

image center returns to the center of the focal plane. Since

optical axis to counteract the image shake.

Optical Image Stabilizer in effect, right in the viewfinder.

Close-up — For close-up shots,

Low-light — In low light situa-

even the tiniest of motions is

tions, when you would normally

magnified and spoils a great

expect to have to use flash or

shot!

tripod, Canon's Optical Image

Stabilizer lenses give you the

freedom of up to 4 stops of light.

EF LENSES

Optical Image Stabilizer Parallel

Movement Principle

1: No Camera Shake

Camera

Shake

2: Lens Front Shake Downward

Optical Image Stabilizer Units

3: Image-stabilizing group counteracting

downward camera shake

Telephoto — Canon designs

each Optical Image Stabilizer

system to complement the

lens' focal length. So even

with telephoto lenses you'll

capture the shot!