Canon EOS-1Ds Mark III Дизайн і продуктивність - Сторінка 8

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III. NEW AND IMPROVED

DESIGN FEATURES

New 16.7 Megapixel

CMOS Sensor

CMOS sensor

EOS-1Ds it replaces, but supporting the same range of ISO settings and producing the

same low noise as the 1D Mark II and surpassing the 1Ds on both counts.

The 1Ds Mark II sensor shares with the 1D Mark II several substantial improvements

made possible by the Canon-developed, on-chip RGB primary color filter together with

larger microlenses that have much smaller gaps between them than those on the 1Ds.

These narrow gaps greatly increase the efficiency of light convergence while greatly

reducing birefringence. Canon has also improved the design of the photo diodes in the

CMOS sensor by eliminating transistors in each pixel, making a greater portion of the

surface area of each pixel sensitive to light.

Photodiode

Normally, it's nearly impossible to provide both high resolution and minimal false color,

but the EOS-1Ds Mark II has a 3-layer optical low pass filter that works with the DIGIC II

chip to reduce false colors while having minimal impact on resolution.

A second-generation, on-chip noise elimination circuit attends to fixed-pattern and random

noise. In addition to longer battery life, the lower power consumption of the CMOS sensor

means that the Signal-to-Noise Ratio is less affected when the sensor's temperature

rises. For long exposures, including those up to several minutes, the circuit-driving

standard current and the power to the output amp are cut off and, as with the 1D Mark

II, the camera applies Dark Frame Subtraction automatically. Additionally, the irregular

image edge colors that occur during long exposures have been reduced dramatically.

Like the EOS-1D Mark II, the 1Ds Mark II is equipped with a low-noise, high-speed

output amp, and can read 8 channels simultaneously per line, enabling a continuous

III. NEW AND IMPROVED DESIGN FEATURES

The heart of the Canon EOS-1Ds Mark II is a state-of-the-

art, 16.7 megapixel, full frame, single-plate CMOS sensor

developed and manufactured by Canon. The 1Ds Mark II

has the world's highest pixel count in a 35mm digital SLR

camera. Its maximum-recorded resolution is 4992 by

3328 pixels. Each pixel is 7.2 µm, smaller than the

8.2 µm of the EOS-1D Mark II sensor or the 8.8 µm of the

Microlens gap

Null area

EOS-1Ds

EOS-1Ds Mark II