Canon EOS 1D Mark III Witboek - Pagina 12

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Also, the second-generation, on-chip noise removal circuit and a

newly-developed noise reduction technology combine to remove

noise effectively. To achieve even less noise, the EOS-1Ds Mark III

has a new output amp that attains both high speed and low noise.

Low noise is also achieved with an improved manufacturing

process, optimized pixel amp, and optimized reading circuit.

Thanks to optimized photo diode construction and finer process-

ing, the photo diode can still accumulate enough light to function

exceptionally well. At low ISO speeds, the dynamic range is about

the same as that of the EOS-1Ds Mark II.

As with the EOS-1D Mark III, single-line, 8-channel parallel reading

is employed. With a low-noise, high-speed output amp, a continu-

ous shooting speed of approximately 5 fps is attained, even with

approximately 21.1 megapixels with which to contend.

The infrared, low-pass hybrid filter in front of the sensor consists

of an infrared-absorption glass (including multiple coatings to

reflect ultraviolet and infrared rays) and low-pass filter (phase

plate sandwiched by two single-crystal plates). Other than opti-

mization for the full-frame CMOS sensor, the specifications are the

same as for the EOS-1D Mark III.

Autofocus

The state-of-the-art AF sensor in the EOS-1Ds Mark III is shared with the EOS-1D Mark III.

The AI SERVO AF algorithm has been optimized to match the continuous shooting speed

of the EOS-1Ds Mark III, approximately 5 fps. Also, due to the full-frame CMOS sensor,

the Area AF coverage with respect to the viewfinder is slightly smaller than with the EOS-1D

Mark III. The AF speed and predictive AF performance are the

same as with the EOS-1D Mark III. All other AF-related specifi-

cations not mentioned here are also the same as the best-in-

class EOS-1D Mark III.

AF Sensor Configuration

: Cross-type AF points

: f/2.8 sensors (Center AF point is f/4)

: f/5.6 sensors

IV. DISCUSSION OF NEW AND IMPROVED FEATURES

: Assist points

(Not user-selectable)

Diagram of 8-channel

Signal Reading

LPF Construction

Dichroic mirror

(Reflects infrared rays)

Infrared-absorbing glass

Low-pass filter

(Separates image in vertical direction)

Phaser layer

(Converts linear polarized

light into circular polarized light)

Low-pass filter

(Separates image in horizontal direction)

3.00

2.25

4.5

6.6

7.50

Time

CMOS

sensor

AF Sensor