Sigma DP0 Quattro. The SIGMA dp0 Quattro incorporates a newly developed Foveon X3 direct image sensor. The new sensor structure features a pixel ratio of 1:1:4 from the bottom, middle to top layer. The Foveon X3 Quattro direct image sensor is able to detect a broad range of light wavelengths. While the top layer captures both brightness and color information, the middle and bottom layers with their larger surface area capture color information only. During the image data processing stage, the brightness data captured in the top layer is applied to the top, middle, and bottom layers, resulting in brightness and color data for each individual pixel. Retaining the principle of the three-layer structure where colors are divided vertically, by applying the brightness data captured in the top layer to the layers below, high resolution and high-speed for broad data processing required are achieved.
The new dp series cameras feature the newly developed TRUE (Three-layer Responsive Ultimate Engine) III. This image processing engine has evolved in pace with our Foveon direct image sensor and incorporates all of the image processing expertise we have developed over the years. Thanks to new refinements, it is the ideal engine for processing the rich and complex image data produced by the new-generation Foveon X3 Quattro direct image sensor. Our proprietary algorithm makes possible ultrafast processing of an immense volume of image data without any deterioration of the final images. The result is high-definition, 3D-like photographs with outstandingly rich color detail.
The lens incorporates a high performance 14mm F4 lens and features 4 FLD ("F" Low Dispersion) glass elements, which have performance equal to fluorite and 2 SLD (Special Low Dispersion) glass elements to minimize chromatic aberration. By incorporating 2 aspherical lenses, including a wide double-sided aspherical lens, distortion is reduced to less than 1% when shot at infinity, maximizing the lens performance to achieve excellent and sharp rendering performance from the widest aperture. The lens is equivalent to a 21mm lens on a 35mm SLR which enables a wide angle of view of 91 degrees and depth of field that are ideal for super wide angle photographic expressions.