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 == ""Focal point"" == 

 This page mentions ""focal point"" twice, and Camera matrix links focal point to this page via a redirect. I think the author is trying to talk about the camera center. If so, that's misleading at best. In as much as a pinhole camera models a real camera, the focal point would better be the principal point. Either way, I've never heard ""focal point"" used with precise meaning in computer vision/graphics. Shall we replace ""focal point"" with more-precise language?   "