One of the things that caught my attention early on when I first rented and tested the Sigma SD Quattro, was the fact that the Foveon sensor effortlessly and accurately rendered the warmth (yellow) of sunlit areas without compromising the cool (blue) tints of the shadows. (5) The proof of all this technology is in the nuanced color it actually captures. Each of the three stacked photodiodes has a different spectral sensitivity, allowing it to respond differently to different wavelengths.” (4) In other words, “the sensor technology is able to measure and report three distinct colors per pixel location” as the wavelengths pass through the silicon wafer. Foveon utilizes an “array of photosites that consist of three vertically stacked photodiodes. This is contrasted by the vast majority of professional and consumer digital cameras that utilize the Bayer filter array (a mosaic of RGB filters that limits every photosite from being exposed to all three primary colors)(3). As a result, “Foveon sensors detect all three primary colors at every pixel location, producing images that are sharper and have significantly reduced image artifacts when compared to competing image sensor technologies.” (2) Foveon made history when it developed and patented the world's first three-layer image capture technology by placing a stack of Red-Green-Blue pixels in each pixel location. When I first handled the Sigma SD Quattro I was impressed that it is an eminently well crafted, solid piece of equipment but what sets the SD Quattro apart from the competition is its stellar Foveon sensor.
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