| 摘要 |
A wide angle lens system of at least two, and preferably four, similar powered symmetrical component lenses is disclosed; these lenses are from object to image, at least two paired concavo-convex lenses, and preferably two lenses of a concavo-convex or convexo-convex type. The first and last lenses are displaced and rotated usually by rotation about the object (taken as a defining aperture of the optical system, such as a portion of the cornea) or its conjugate, in a first direction to use lens portions between the lens center and one edge; the intermediate lens (preferably the second and third lenses) are displaced and rotated (again usually by rotation about the image conjugate formed by the first lens) in an opposite direction to use the lens portions between the other lens edge and center. Deflected rays in the lens system utilize marginal portions of the lens between the center and one edge only; neither the non-deviating portion of the spherical lenses nor the opposite side of the spherical lenses are used. The lenses are non-concentric. Consequently, the lenses can be further minimally rotated as required for optimum flare rejection.
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