Patent ID: 6754008
Filing Date: 2004-06-22
Classification: G02B

Abstract:
A finite conjugate lens system, comprising, in order from a from a camera side to an object side:a first lens group; a second lens group; and a third lens group configured to provide a plurality of demagnification levels, wherein the first and/or second lens groups are adapted so that when light is passed from the object side to the image side, a substantially sized region of collimated light is formed between the first and second lens group, wherein the lens system satisfies the following conditions (1) and (2): 0.90.90where f/# and RI are focus number and relative illumination respectively, both the f/# and the RI being obtained across a field of view at an image plane at the camera side having a diameter greater than or equal to 26 mm, and both the f/# and RI being obtained for the plurality of demagnification levels.