Canon EOS-1D Manuel d'utilisateur télécharger pdf (Page 36)

100-12800 (with extended range options of L:

50, H1: 25600, H2: 51200, H3: 102400)!* This

greatly expanded capability provides a previ-

ously unavailable range of real-world shooting

options, especially in available-light or dim sit-

uations. Also significant is the camera’s

improved low ISO range performance. The

camera’s CMOS sensor features advance-

ments that make it possible to operate with

reduced electrical charge saturation. This

improves imaging performance at the low end

of the ISO scale, which can be highly useful

when shooting high contrast scenes with fast

(e.g., f/1.4) lenses. Blown highlights can be

avoided, and photographers can use wider

apertures to control depth-of-field in ways not

possible at higher ISO settings. And at higher

ISO settings where one might expect to see an

increase in digital noise, the renowned Canon

CMOS sensor and noise reduction system work

together to ensure superb image quality.

Accordingly, even the most critical photogra-

phers can use their EOS SLR camera with con-

fidence, no matter the light.

*Standard output sensitivity. Recommended exposure index.

14-Bit A/D Conversion

EOS digital SLR cameras employ 14-bit con-

verters to process the output of the imaging

sensor. Compared to the 12-bit converters

used in most digital cameras, the Canon

design delivers more lifelike, robust colors and

tones. RAW images are recorded at 14 bits so

that processed 16-bit TIFF images contain the

full range of tonal values captured by the sen-

sor. With every click of the shutter each record-

ed color channel provides 16,384 separate

steps of brightness, from darkest to lightest.

This means smoother tonal transitions, more

natural gradations, and superb color fidelity,

all in-camera.

Highlight Tone Priority

Canon’s Highlight Tone Priority feature extends

the dynamic range of highlights by about one

stop and improves gradation within highlight

areas. By expanding the range from the correct

exposure level (18% gray) to the maximum

allowable highlight level, the gradation from the

grays to the highlights becomes smoother and

loss in highlight detail is minimized.

digital cameras. For maximum control and

dependable performance Canon full-frame

digital SLR cameras are simply unparalleled.

DIGIC Processors

Developed in-house to

maximize performance

between the capturing and recording stages

of digital photography, Canon DIGIC Image

Processors use advanced signal processing

technologies to dramatically enhance image

quality and deliver a more intuitive, respon-

sive camera. The DIGIC Image Processors work

in concert with Canon CMOS sensors to

achieve even higher levels of performance in

every facet of the image capture process.

Signal processing algorithms work with the

multi-channel signal from the sensor and the

high-speed DDR-SDRAM buffer to deliver sig-

nificantly improved camera response. With

low power consumption, battery life is extend-

ed. Color reproduction, noise reduction in low

light situations and reproduction of fine detail

are all significantly improved. In addition, the

latest DIGIC 4 Image Processor speed up all

computation-intensive operations, dramati-

cally improving camera responsiveness and

making possible a number of advanced fea-

tures. Canon technologies like Face Detection

Live mode, Full HD and HD movie recording,

Lens Peripheral Illumination Correction and

Auto Lighting Optimizer are all possible

thanks to the power afforded by the amazing

DIGIC Image Processor.

Wide ISO Ranges

EOS SLR cameras feature an extensive ISO

range for immense flexibility in diverse photo-

graphic situations. For example, the EOS-1D

Mark IV features the breathtaking ISO range of

Spectacular Image Quality,

Second to None

Canon CMOS Sensors

Taking advantage of its own proprietary tech-

nological and manufacturing capabilities,

Canon develops and produces its own CMOS

sensors for the entire EOS line of digital SLRs.

Unlike CCD sensors, CMOS sensors convert

and amplify signals before they are transferred

to the image processor, enabling them to pro-

duce exceptionally clean image data and

reduce power consumption by as much as

90%. Thanks to multi-channel signal paths

that dramatically improve camera responsive-

ness, data transfers through CMOS sensors

occur with great speed. To combat both fixed

pattern and random digital noise, Canon

CMOS sensors incorporate a unique on-chip

noise reduction technology. In addition, a mul-

tilayer low-pass filter is placed in front of the

sensor to isolate false colors that the sensor

may detect. Then, Canon’s own DIGIC Image

Processor analyzes and renders the image to

help eliminate those colors while retaining full

detail. A mainstay of the entire EOS line,

Canon CMOS sensors deliver outstanding res-

olution and signal purity, making them ideal

for the most critical applications.

Full-Frame Canon

CMOS Sensors

The Canon-manufactured full-

frame CMOS sensor delivers

professional performance with digital conve-

nience. EOS digital SLR cameras with full-

frame sensors, like the EOS-1Ds Mark III and

EOS 5D Mark II, do not require a focal length

conversion factor common to other digital SLR

cameras on the market. Full-frame sensors

provide greater control over depth-of-field,

which helps to create beautiful background

blur, perfect for portraits. The large sensor

area also makes possible a marked reduction

in noise levels at all ISO values. When com-

bined with high resolution and smooth grada-

tion from highlights to shadows, Canon digital

SLR cameras with full-frame sensors produce

images that rival those taken with profession-

al medium-format and large-format film and

36.0 mm

24.0 mm

EOS-1Ds Mark III Full-Frame

CMOS Sensor (Actual Size)

Technology that Sets the

Professional Standard

STILL CAPTURE TECHNOLOGY

Photo diode

Photo diode size

Pixel pitch

Pixel size

Conceptual Diagram of Gapless Microlens &

Opening Ratio

Dichroic mirror

(Reflects infrared rays)

Infrared-absorbing glass

Low-pass filter

(Separates image in vertical direction)

Low-pass filter

(Separates image in horizontal direction)

Phaser layer

(Converts linear polarized light

into circular polarized light)

CMOS sensor

Low-pass Filter Construction (EOS-1Ds Mark III)

When using the same lens with different cameras, the

angle-of-view varies depending on the sensor size.

Full-Frame (1.0x)

APS-C (1.6x)

APS-H (1.3x)

Time

Conceptual Diagram

of 8-channel Signal

Reading

Pixel size

[μm square]

ISO speed range

EOS-1D Mark III

100 - 3200

H 640050 L

7.2

EOS 5D Mark II

6.4

100 - 6400

50 L

25600

5.7

EOS-1D Mark IV

102400

100 - 12800

50 L

H1 H3

ISO Speed Range

card

Front-end

Processing

circuit

Front-end

Processing

circuit

DIGIC 4

DDR2

SDRAM

DDR2

SDRAM

A/D

conversion

A/D

conversion

A/D

conversion

A/D

conversion

Conceptual Diagram of Image Proccessing

(EOS-1D Mark IV)

Highlight Tone Priority: ON

Highlight Tone Priority: OFF

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Canon EOS-1D Manuel d'utilisateur Page 36

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