Telephoto lens system

Details Telephoto lens system Telephoto lens system

1995-05-02

1997-05-06

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

359747, G02B 1302

Patent

active

056276850

ABSTRACT:
The invention provides a telephoto lens system that enables the camera operator to shoot an infinite to nearby object with stably maintained optical quality. This lens system comprises a first positive lens unit G.sub.1, a second positive lens unit G.sub.2, a third negative lens unit G.sub.3 and a fourth positive lens unit G.sub.4. The first unit comprises at least two positive lenses and a negative meniscus lens heavily concave on the image surface side; the second unit comprises a positive lens heavily convex on the object side and a doublet consisting of negative and positive lenses; the third unit comprises a doublet consisting of negative and positive lenses; and the fourth unit comprises a cemented doublet consisting of negative and positive lenses. While the first and second units remain fixed, the third and fourth units are moved for focusing. Specific conditions regarding the focal lengths of the units, the separation between adjacent units, and the amount of movement of the units are satisfied.

REFERENCES:
patent: 4966449 (1990-10-01), Maruyama

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