Patent ID: 6490101
Filing Date: 2002-12-03
Classification: G02B

Abstract:
A fixed focal length wide-angle lens system consisting of a negative first lens group and a positive second lens group with a diaphragm, in this order from an object,wherein upon focusing, said positive second lens group is moved along the optical axis and said negative first lens group is fixed, and wherein said wide-angle lens system satisfies the following conditions: 0.5<TL2/f<1.0 âˆ’4<f1/f2whereinTL2 designates the distance, in said second lens group, between the most object-side surface of the most object-side lens element and the most image-side surface of the most image-side lens element; f designates the focal length of the entire lens system when an object at an infinite distance is in an in-focus state; f1 designates the focal length of said first lens group; and f2 designates the focal length of said second lens group.