High magnification zoom lens

Details High magnification zoom lens High magnification zoom lens

1995-06-14

1997-02-25

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359688, G02B 1514

Patent

active

056064594

ABSTRACT:
A high-magnification zoom lens having a lens system that is movable from a wide angle setting to a telephoto setting includes five lens groups. The lens system has a focal length of fW in the wide angle setting and a focal length of fT in the telephoto setting. The five lens groups are arranged in order from an object side along an optical axis that extends from a center of the lens system. A first lens group G1 has a positive refractive power and a focal length of f1, a second lens group G2 has a negative refractive power and a focal length of f2, a third lens group G3 has a negative refractive power and a focal length of f3, a fourth lens group G4 has a positive refractive power, and an image composing lens group GR has a positive refractive power. When the lens system changes from the wide angle setting to the telephoto setting, the first lens group G1 and the fourth lens group G4 move such that a distance between the first lens group G1 and the second lens group G2 increases, a distance between the third lens group G3 and the fourth lens group G4 decreases, and several conditions are satisfied.

REFERENCES:
patent: 5325233 (1994-06-01), Nakatsuji et al.
patent: 5442485 (1995-08-01), Yamanashi

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