Sigma DP1 Quattro is a brand new APS-C sized Foveon image sensor. The exact size of the image sensor used in the DP1 Quattro camera is 23.5x15.7mm, slightly larger than the DP1 Merrill's sensor. Sigma are still the only manufacturer to use the Foveon X3 sensor, quoting the resolution of the DP Quattro as 39 megapixels...
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