Zoom lens system having high zoom ratio

Details Zoom lens system having high zoom ratio Zoom lens system having high zoom ratio

G - Physics

02

B

G02B 15/15 (2006.01) G02B 15/17 (2006.01)

Patent

CA 2212687

A zoom lens system of high zoom ratio includes comprising a first positive lens group, a second negative lens group, a third negative lens group, and a fourth positive lens group, arranged in this order from the object side. The second and third lens groups are moved without moving the first and fourth lens groups upon zooming. The lens system satisfies the condition (1) 1 < (D3W - D3T)/fw < 6, wherein D3W represents the distance between the third lens group and the fourth lens group at the short focal length extremity, D3T represents the distance between the third lens group and the fourth lens group at the long focal length extremity, and fw represents the focal length of the entire lens system at the short focal length extremity.

Cette invention concerne un objectif zoom à grande variation focale comprenant un premier groupe de lentilles positives, un deuxième groupe de lentilles négatives, un troisième groupe de lentilles négatives et un quatrième groupe de lentilles positives, disposés dans cet ordre à partir de l'objet visé. € la variation de focale, le deuxième et le troisième groupes de lentilles se déplacent alors que les premier et quatrième groupes demeurent immobiles. L'objectif réalise alors la condition (1) 1 < (D3W - D3T)/fw < 6, où D3W représente la distance entre le troisième et le quatrième groupes de lentilles à l'extrémité courte distance focale, D3T la distance entre le troisième et le quatrième groupe de lentilles à l'extrémité grande distance focale et fw la longueur focale de l'objectif complet à l'extrémité courte distance focale.

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