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Newly Developed, High-

Resolution 10.1 Megapixel

CMOS Sensor

III. FEATURE DISCUSSION

10.1 Megapixel CMOS Sensor

photo industry. Canon has now produced over 5 million CMOS sensors, all for use

exclusively in Canon DSLR cameras. The experience this achievement represents, in

addition to constant R&D efforts, has enabled Canon to refine and improve its image

sensors to their current remarkable level.

The image sensor in the Digital Rebel XTi measures 22.2 by 14.8 mm. Each of its 10.1

million pixels measures 5.7 µm square. Its predecessor, the Digital Rebel XT, had 8.0

megapixels, each measuring 6.4 µm square. Several improved technologies help the

XTi to continue the Canon tradition of offering a wide range of ISO settings (100-1600),

all of which are highly usable and characterized by very low noise despite the smaller

pixel size that is a function of higher resolution. First, the spacing between the on-chip

microlenses is now about half of the Digital Rebel XT's. This new configuration gathers

light much more effectively, loses less light between the microlenses, and improves

light convergence. Second, a higher percentage of each pixel's surface area is sensitive

to light. Third, the output amplifiers have been optimized, lowering noise. Last, the

second-generation, on-chip noise reduction circuit minimizes random noise and

removes fixed-pattern noise. As a result, the XT and the XTi have the same signal-to-

noise ratio and equivalent dynamic ranges despite the smaller pixels of the XTi. Finally,

the 3 frames-per-second continuous shooting speed of

the XT has been maintained notwithstanding the larger

file size of the XTi. The combination of two-channel read-

out from the sensor, increased processor clock speed

and improved performance of the output amps is respon-

sible for this accomplishment.

The infrared-blocking, optical low-pass filter is an integral

part of the sensor package, and is divided into two indi-

vidual components for the first time. Low-pass filter #1 is

part of the Self Cleaning Sensor Unit. Its front surface is

coated with a dichroic mirror that reflects infrared wave-

lengths. LPF #1 also separates the subject image into two

III. FEATURE DISCUSSION

The all-new Canon CMOS sensor in the EOS Digital Rebel

XTi gives this camera the highest overall performance in

its class. Like all other Canon CMOS sensors, this unit is

designed and manufactured by Canon using semiconduc-

tor manufacturing equipment which was also designed

and manufactured by Canon. This fully-integrated design

and manufacturing system makes Canon unique in the

Dichroic mirror

(Reflects infrared rays)

3. Infrared-absorbing glass

CMOS

sensor

4. Low-pass filter 2

(Separates image in

vertical direction)

2. Phaser layer

(Converts linear polarized

light into circular polarized light)

1. Low-pass filter 1

(Separates image in horizontal

direction)