Lens system

Details Lens system Lens system

1998-04-15

1999-08-10

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

059367792

ABSTRACT:
A telephoto lens system consisting of a front lens group and a rear lens group: the front lens group being composed of a first lens unit which is composed only of a positive lens components and a second lens unit which is composed only of negative lens components, and the rear lens group being composed of a third positive lens unit, a fourth negative lens unit and a fifth positive lens unit. This lens system has a back focal length long enough to permit disposing filters such as a low pass filter and optical path splitting members.

REFERENCES:
patent: 3926506 (1975-12-01), Maeda
patent: 5418648 (1995-05-01), Ono

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