Patent ID: 6246529
Filing Date: 2001-06-12
Classification: G02B

Abstract:
A wide-angle zoom lens system comprising a negative first lens group, a positive second lens group, a diaphragm, and a positive third lens group, in this order from an object;wherein upon zooming from the short focal length extremity towards the long focal length extremity, each lens group is arranged to move so that the space between said first and second lens groups and the space between said second and third lens groups are narrowed; andwherein said wide-angle zoom lens system satisfies the following condition:0.36<(D2S-D2L)/(fL-fS)<0.7wherein:D2S designates the distance between said second lens group and said third lens group at the short focal length extremity;D2L designates the distance between said second lens group and said third lens group at the long focal length extremity;fL designates the focal length of the entire lens system at the long focal length extremity; andfS designates the focal length of the entire lens system at the short focal length extremity.