Inner focusing type telephoto zoom lens

Details Inner focusing type telephoto zoom lens Inner focusing type telephoto zoom lens

1991-04-15

1992-08-04

Howell, Janice A.

Optical: systems and elements

Lens

With variable magnification

359684, 359713, G02B 1514

Patent

active

051364301

ABSTRACT:
An inner focusing type telephoto zoom lens includes a fixed first lens group having a positive refractive power, the first lens group being disposed closest to the object, a second lens group having a negative refractive power, the second lens group being movable along an optical axis for focusing, a fixed third lens group having a positive refractive power, a fourth lens group having a negative refractive power, the fourth lens group being movable along the optical axis for zooming, a fifth lens group having a positive refractive power, the fifth lens group being movable along the optical axis relative to the fourth lens group, and a fixed sixth lens group having a positive refractive power. The zoom lens satisfies the following condition:

REFERENCES:
patent: 4110006 (1978-08-01), Ikemori
patent: 4752121 (1988-06-01), Kitagishi
patent: 4848883 (1989-07-01), Maruyama
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5048939 (1991-09-01), Yatsu et al.
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 5061051 (1991-10-01), Miyamae

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