The Sigma DP2 uses the Foveon X3 sensor. This is a unique, triple-layer design where red, green and blue pixels are arranged in a vertical stack and each pixel in the final image has full colour information from the start. As a result, the pixel-level definition is genuinely startling.
DP2 produces files of only 4.7MP though Sigma points out that the total pixel count is actually 14.1MP which is true – it has as many red, green and blue photo sites as a conventional 14MP sensor. Its output files, though, aren’t the same size.
