Patent ID: 6580568
Filing Date: 2003-06-17
Classification: G02B

Abstract:
A telephoto lens system comprising a positive first lens group, a negative second lens group and a positive third lens group, in this order from an object,wherein upon focusing from infinity toward the shortest photographing distance, said second lens group moves toward an image, and wherein said telephoto lens system satisfies the following conditions: 1.351<1.80 1.302|<1.85 0.483<0.75 0.102/f2|<0.22 wherein f designates the focal length of said entire telephoto lens system; f1 designates the focal length of said first lens group; f2 designates the focal length of said second lens group; f3 designates the focal length of said third lens group; andL2 designates the distance between said second lens group and said third lens group when an object at an infinite photographing distance is in an in-focus state.