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Originally Posted by [1ponders]
What are the pixel sizes Jim? The larger the pixel size the more sensitivity, the larger the chip the wider the field.
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Image sensor The heart of the camera is a new 10.08 million image pixel, 22.2mm x 14.8mm Canon-designed and manufactured CMOS image sensor with a
5.7µm x 5.7µm pixel pitch, bayer pattern RGB filter array, high-efficiency microlenses and two-part optical low pass/IR cut filter. The focal length cropping factor is approximately 1.6x, relative to 35mm film; the sensor's physical dimensions are identical to that of the Rebel XT/350D, which makes the sensor ever so slightly smaller than that of Canon's EOS 30D and previous midrange digital SLRs. The sensor's data is read out in 2 channels; Canon's DIGIC II is the imaging engine. Capture bit depth is 12 bits per colour, which is then converted to 8 or 16 bits per colour depending on file format and processing.
Chuck Westfall, Canon USA's Director of Media and Customer Relationship, says that dynamic range and noise levels with the Rebel XTi/400D are nearly identical to the camera it replaces, despite the smaller pixel size of the new model (5.7µm square vs 6.4µm square for the Rebel XT/350D). This, says Westfall, is because of an improved
fill factor - the gap between the sensor's microlenses has been reduced, and the light-sensitive area of each pixel has been further increased through other design improvements. If true, this is likely to make the Rebel XTi/400D the best high-ISO performer of the new crop of 10MP cameras that have emerged in 2006.
source:
http://www.robgalbraith.com/bins/mul...id=7-7897-8492