3d Tracking and a cropped sensor

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    Cornholio
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    Can anyone advise on which focal length to use when tracking footage shot with a cropped sensor DSLR?

    Specifically, I have shot 1080p footage on my Canon 60d with a canon 50mm prime.
    The CCD/film gate size is 22.3mm x14.9mm, but it has a crop factor of 1.6.
    So, should I use a focal length of 50mm or the crop factor equivalent of 80mm?

    Any help/clarification would be great.
    Thanks!

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