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From dpreview
Both cameras use the latest, 'Quattro' version of Sigma's Foveon technology, which measures different color information based on how deeply into the sensor it is able to penetrate. The Quattro design features full resolution at the top (predominantly blue-sensing) layer but then 1/4 of that resolution for the two deeper layers used to interpret information about red and green color components.
The APS-H sensor features 25.5MP in its top layer, which the company considers equivalent to the capture of a 51 megapixel sensor using the conventional Bayer design. This 26.6 x 17.9mm sensor is around 30% larger than the more common APS-C size, but it's currently unclear what proportion of Sigma's 'DC' lenses designed for APS-C offer a large enough image circle for use with the camera.
Odd design, but I like it.
Both cameras use the latest, 'Quattro' version of Sigma's Foveon technology, which measures different color information based on how deeply into the sensor it is able to penetrate. The Quattro design features full resolution at the top (predominantly blue-sensing) layer but then 1/4 of that resolution for the two deeper layers used to interpret information about red and green color components.
The APS-H sensor features 25.5MP in its top layer, which the company considers equivalent to the capture of a 51 megapixel sensor using the conventional Bayer design. This 26.6 x 17.9mm sensor is around 30% larger than the more common APS-C size, but it's currently unclear what proportion of Sigma's 'DC' lenses designed for APS-C offer a large enough image circle for use with the camera.
Odd design, but I like it.
