Diyphotography reports that Sigma could be working on a Foveon sensor for video use:
"That lack of speed, though, has put off many potential Sigma camera owners. Now, a new patent has been filed showing that Sigma looks to be doing something about it. The patent seems to aim more toward the video side of things but no doubt it will speed up its stills capturing capabilities, too. Perhaps this is why Sigma semed a little evasive about camera questions recently at PPE. It might also explain why Sigma have gone so gung-ho on the Cinema lenses lately."
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