Patent ID: 6894847
Filing Date: 2005-05-17
Classification: G02B

Abstract:
1. A retrofocus, wide-angle lens formed of two lens groups, in order from the object side, as follows: a first lens group having negative refractive power; a stop; and a second lens group having positive refractive power; wherein said first lens group includes a meniscus lens element having positive refractive power with its convex surface on the object side, two meniscus lens elements, each of negative refractive power with its convex surface on the object side, and a lens that has a center thickness that is greater than the center thickness of any of said three meniscus lens elements; and said second lens group includes a cemented lens component that includes a lens element having negative refractive power that is cemented to a biconvex lens element, an air space, and a meniscus lens component having negative refractive power with its concave surface on the object side.