The lens specifications, in terms of numbers of elements and groups, and minimum focusing distances, remain unchanged from the existing 'Merrill' models. The dp1, dp2 and dp3 Quattro models will continue to feature 19mm, 30mm and 50mm F2.8 lenses, offering 28mm, 45mm and 75mm equivalent fields of view, respectively. In addition to offering JPEGs at its 19.6MP luminance resolution, a 'Super-High' 39MP JPEG mode will also be offered (14-bit Raw files will include full 16.9+4.9+4.9MP data). The company promises 'the same exacting standard of image quality' as its existing models. In principle we'd expect this to lose a little of the color resolution that Foveon chips have been known for, but until we've had a chance to play with one, we won't know how much difference it'll make. The Foveon X3 'Quattro' sensor samples 19.6MP of data at its top layer, but only 4.9MP at the two lower levels, meaning it captures higher luminance resolution than color resolution (something that's also true of conventional 'Bayer' sensors). The idea is that the top, 19.6MP layer will capture the majority of the luminance information, that is interpreted as resolution, with the deeper layers providing the color information. The company says the 4:1:1 ratio maintains most of the color resolution advantages of the existing Foveon design while reducing the amount of data that needs to be handled - speeding up processing and improving the noise characteristics. The sensor will also appear in 28mm and 75mm equivalent dp1 Quattro and dp3 Quattro models. The Quattro sensor still uses three layers to detect color information but now only captures its full, 19.6 million pixel resolution in the top layer, with lower two layers capturing 4.9MP of information each. The latest, 45mm-equivalent, model features dramatic styling and a fundamental re-think of the company's Foveon multi-layer sensor design. Sigma has revealed the next generation of its DP series of APS-C sensor, fixed focal length cameras, with the dp2 Quattro.
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