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Canon EOS Digital Rebel XT Digital SLR
Canon EOS Digital Rebel XT Digital Technology
The EOS Digital Rebel XT digital SLR includes Canon's latest CMOS image sensor technology as well as the new DIGIC II Image Processor. The CMOS features high-speed 4-channel data reading, brilliant new microlens technology, a 2nd generation, on-chip noise-reduction circuit, and low-noise, high-speed amp, which produces accurate color, extremely low noise and fast recording even at ISO's of 400 and above.
Canon's DIGIC II image processor is without question, the most powerful imaging processor that the company has ever put into a digital camera. It boasts improved color reproduction of high-saturation, bright subjects, improved auto white balance precision, and wider dynamic range in highlight areas. In addition to its image quality improvements, the DIGIC II chip is also responsible for speeding up camera performance in areas such as start-up time, autofocus calculation, card-writing speed, direct printing and data transfer speed through the new USB 2.0 High Speed interface.
Entirely New 8.0 Megapixel CMOS Sensor
The component of the new Canon EOS Digital Rebel XT camera that will immediately grab your attention is the all-new, Canon-designed and manufactured, 8.0 effective megapixel, single-plate, CMOS sensor. Canon's large area CMOS (complementary metal oxide semiconductor) Sensor captures images with exceptional clarity and tonal range. This second generation APS-C size sensor (22.2 x 14.8mm) has the same 3:2 ratio as film cameras, enabling an effective angle of view that is 1.6x the normal EF Lens focal length. Each pixel is a generous 6.4 µm square.
CMOS sensor |
Several engineering features account for the sensor's wide ISO range (100 to 1600), low noise, high dynamic range, and low power consumption. The configuration of each photo diode in each pixel has been optimized; detail processing has been improved, and a greater portion of each pixel is now sensitive to light. The microlens array which gathers light for the sensor has a new design, shared with the microlenses in the EOS-1Ds Mark II, 1D Mark II and 20D that reduces the gaps between the lenses. This narrow-gap array gathers light more efficiently and loses less light between the lenses.
New, High-Performance, 3-Layer Optical Low-Pass Filter
The new, 3-layer optical low-pass filter has the same construction as the EOS 20D's filter, an infrared-absorbing glass and three crystal plates having different optical axes. A dichroic mirror with a dielectric, multi-layer coating on the front surface deflects light over a wide range of infrared wavelengths. There is also an infrared-absorbing glass layer to absorb near-infrared wavelengths in the visible spectrum.
The low-pass filter incorporates two monocrystal plates that separate the subject image into four horizontal and vertical directions. Between these two plates is a phase plate, also monocrystal, which converts the linear polarized light into circular polarized light. The first crystalline plate separates the image into two images horizontally. The linear polarized light is converted into circular polarized light by the phase plate. The second crystal plate separates the images vertically, resulting in four duplicate images arranged in a square matrix. The image separation in the horizontal and vertical directions is optimized for the sensor pitch so that false colors and moire caused by minute horizontal and vertical lines in the subject are reduced while resolution is actually increased. Additionally, this hybrid construction, with its deflecting and absorbing layers, reduces image fogging and red ghosting caused by sensor reflections.
Second-Generation On-Chip Noise Reduction Technology
The CMOS sensor features a second generation, on-chip, noise-reduction circuit that includes a new low-noise gain amp and an offset reduction circuit. The signal is amplified in slow-read steps. The result is the effective elimination of random noise and fixed pattern noise. With the EOS Digital Rebel XT camera, one can even photograph the heavens in the night sky with very low noise.
To minimize the increase in power consumption caused by upgraded components such as the larger sensor and the faster reading of the sensor's output, the output amp's power consumption is kept to an absolute minimum. As with the EOS 20D, power to the output amp is cut off and circuit-driving standard current is also cut off during long exposures. Less power is used and noise is further reduced.
New DIGIC II Image Processor
Canon's newest and most powerful SLR imaging engine, DIGIC II provides high-precision and high speed, natural color reproduction including high-saturation, bright subjects, improved auto white balance, along with increased white balance correction control and white balance bracketing (another legacy of EOS 20D advances), compared to the original Digital Rebel camera.
The DIGIC II's newly-developed algorithm yields improve color reproduction, especially with high-saturation, bright subjects, improved auto white balance precision for a wide range of scenes and light sources, and wider dynamic range in highlight areas.
Fast 3 Frames-per-Second 14-Frame Burst and 0.2 Second Startup Time
The DIGIC II Image Processor brings a host of significant improvements in speed of operation, control, noise reduction and image quality to the EOS Digital Rebel XT camera. The camera starts up in a near instantaneous 0.2 second. Its shutter release lag time is now only 100 milliseconds and viewfinder blackout time has been reduced to 175 milliseconds. The EOS Digital Rebel XT camera can shoot up to 3 frames per second at its full JPEG Large/Fine 8 megapixel resolution. The DIGIC II's major reduction in buffer clearance times and its huge increase in write speed to the CompactFlash card enable a burst performance of 14 consecutive frames for 8 megapixel JPEG Large/Fine files and 5 consecutive frames for 8 megapixel RAW files.
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