Standard zoom lens system

Details Standard zoom lens system Standard zoom lens system

2007-12-27

2010-10-05

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07808720

ABSTRACT:
A standard zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, the distance between the negative first lens group and the positive second lens group decreases, and the distance between the positive second lens group and the positive third lens group increases. The most image-side surface of the positive second lens group is a concave surface. The standard zoom lens system satisfies the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.15<Rs/fT<0.18  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein Rs designates the radius of curvature of the most image-side surface of the positive second lens group (Rs>0); and fT designates the focal length of the entire standard zoom lens system at the long focal length extremity when an object at an infinite distance is in an in-focus state.

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