Patent ID: 8873167
Filing Date: 2014-10-28
Classification: G02B

Abstract:
1. A lens forming primary and secondary images, said images having focal planes and peak intensities, said lens comprising lens elements, said lens elements made of materials and having dimensions and locations, and said lens elements in order from object to image comprising: a) a first meniscus lens element with negative power, b) a second lens element with negative power having a concave image surface, c) a third lens element with positive power, d) an aperture stop, e) a lens group comprising a positive power lens element and a negative power lens element wherein the positive and negative lens elements form a cemented doublet and the image surface of the negative lens element is flat or convex and it is made from an optical material having an Abbe number less than 24, wherein the materials, dimensions and locations of the lens elements are selected such that the focal plane of the secondary images are not coincident with the focal plane of the primary image, and wherein said lens has a field of view of at least 145 degrees.