Telephoto zoom lens

Details Telephoto zoom lens Telephoto zoom lens

Filed on

1985-05-16

Date issued

1987-05-05

Examiner

Corbin, John K.

Other Related Categories

G02B 964, G02B 1516

Type

Patent

Status

active

Patent number

046627243

Description

ABSTRACT:
A zoom lens consists of a first lens group of positive refractive power, a second lens group of negative refractive power, a third lens group of positive refractive power and a fourth lens group of positive refractive power arranged in the named order from the object side. A zoom lens is characterized in that as the second lens group, there is used a lens group comprising a first cemented lens component composed of a positive and negative lens elements cemented together and having a negative composite refractive power and a second cemented lens component composed of negative and positive lens elements cemented together and having a negative composite refractive power arranged in the named order from the object side, and in that in the first cemented lens component of the second lens group there is provided a cemented surface having a negative refractive power thereby preventing the increase of coma at the wide angle side while reducing the variation of coma with magnification change and also increasing the negative refractive power of the second lens group which enables to realize a compact construction of the zoom lens.

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