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The SD1 created a huge amount of interest when it was announced at Photokina 2010. Having used Foveon's original 4.7x3MP sensor in its SD and DP series of cameras, Sigma bought the sensor company in 2008 and instructed it to focus its efforts on high quality stills photography. The result was a 15x3MP sensor of the standard APS-C size (approx. 24 x 16mm, slightly larger than Foveon's previous designs), and it's around this that the SD1 is built.
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