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Sigma SD10
The Sigma SD10 digital SLR ($2,000 street) is the second camera to use the innovative Foveon X3 CMOS image sensor (the first was the Sigma SD9. The SD10 employs a second-generation sensor that offers improved low-light sensitivity and lower image noise than the previous model. On the outside, the SD10 is virtually identical to the SD9. But thanks to the new sensor, the SD10 operates at ISO speeds up to 1,600 (compared with 400 for the SD9). Also, you can now adjust exposure in increments of 1/3 stop (instead of 1/2 stop on the SD9). And the SD10 extends the maximum shutter speed to 30 seconds, a must-have feature for low-light photography.
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Sigma SD9
The Sigma SD9 ($1,400 street) is the only camera to use the innovative new Foveon X3 chip, the first chip that is sensitive to all three primary colors. Conventional CMOS and CCD image sensors are monochromatic, so they use a mask of colored dots (called a Bayer mask) overlaid on the sensor. Electronics in the camera read information from the sensor at the instant of exposure and generate a three-color RGB value for each pixel using a process called interpolation. The X3 sensor produces an RGB value for each pixel on the chip, eliminating the need for the mask and the interpolation
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