Inner focus type telephoto zoom lens

Details Inner focus type telephoto zoom lens Inner focus type telephoto zoom lens

1994-11-10

1996-11-05

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359686, 359691, G02B 1514

Patent

active

055722768

ABSTRACT:
An inner focus type telephoto zoom lens which includes a first lens group having a positive power, and a rear lens group of a variable power having a plurality of lens groups, located in this order from an object side. The first lens group includes a first sub-group of lenses which is not moved for focusing, and a second sub-group of movable positive lenses that are moved along an optical axis to for focusing.

REFERENCES:
patent: 3594066 (1971-07-01), Cook et al.
patent: 4395092 (1983-07-01), Itoh
patent: 4752121 (1988-06-01), Kitagishi
patent: 5059007 (1991-10-01), Tanaka
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5325234 (1994-06-01), Yoneyama
patent: 5416639 (1995-05-01), Yamanashi
patent: 5448412 (1995-09-01), Maruyama

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