Patent ID: 7477461

Claim:
A wide-field objective lens system comprising: a. first lens having a first aspheric surface and a second aspheric surface, wherein the first surface of the first lens is closest to an object to be imaged; b. a second lens having a first aspheric surface and a second aspheric surface, wherein the first surface of the second lens is adjacent to the second surface of the first lens; c. a third lens having a first aspheric surface and a second aspheric surface, wherein the first surface of the third lens is adjacent to the second surface of the second lens, and further wherein the second surface of the third lens is closest to an image plane of the object; and d. an aperture stop positioned between the first lens and the second lens, wherein a full angular field of view of the lens system is between 50 and 70 degrees, and further wherein a chief ray incident on an image plane has an incident angle less than 20 degrees.