Sorry but dont know where you get the impression that canon used ccd sensors they havent use a ccd sensor since the first D1 all canon sensors are cmos as they have less noise and better colour rendition and are more expensive to make hence canon making their own.Nikon have used ccd sensors all the time until recently when they started using cmos as they are better at noise reduction then ccd. People used ccd because they were cheap also nikon use sensors made by sony apart from the new D3 i dont know who make that one.
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