What is principal point.
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The principal point is the point on the image plane onto which the perspective center is projected.
It is also the pointfrom which the focal length of the lens is measured.
Near the principal point is theprincipal point of autocollimation (PPA)
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The principal point is the point on the image plane onto which the perspective center is projected. It is also the point from which the focal length of the lens is measured. Near the principal point is the principal point of autocollimation.
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