| 摘要 |
The proposed pancratic attachment to a lens contains five elements. The first and the fifth elements are fixed. The second and the fourth elements are installed with a possibility of joint movement. The third element is installed with a possibility to move relative to the second and fourth elements. The first element contains a positive lens and a positive meniscus with a concave surface that faces the lens. The second and the fourth elements are designed as a positive lens with identical focal distances. The third element contains a biconcave lens and, additionally, a positive meniscus with the concave surface on the side opposite to the lens. The fifth element is designed as a positive lens. The present invention provides a possibility to reduce the curvature of the vision field, astigmatism, and magnification chromatism of the lens.
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