III. NEW AND IMPROVED DESIGN FEATURES 8
New 16.7 Megapixel
CMOS Sensor
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
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.
Normally, it’s nearly impossible to provide both high resolution and minimal false color,
b
ut 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
Photodiode
Null area
Microlens gap
EOS-1Ds EOS-1Ds Mark II
CMOS sensor
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