Tele-objective lens with a movable sub-group for focusing

Details Tele-objective lens with a movable sub-group for focusing Tele-objective lens with a movable sub-group for focusing

Filed on

1980-04-10

Date issued

1982-04-13

Examiner

Corbin, John K.

Other Related Categories

350469, G02B 960, G02B 934

Type

Patent

Status

active

Patent number

043244580

Description

ABSTRACT:
A telephoto objective lens consisting of a positive front lens group and a negative rear lens group which is divided into sub-groups, the rear one being movable for focusing and the front one remaining stationary, thereby the weight of the complete objective is minimized. As the front lens group consists of only one positive and only one negative lens element, since the provision for focusing is made at such lens, this objective lens tends to produce aberrations of which the spherical and comatic aberrations are particularly deteriorated. According to the invention, therefore, the frontmost surface and rearmost surface of the front lens group and the rearmost surfce of the movable sub-group are specified in radius of curvature to achieve good stability of correction of the aberrations throughout the focusing range.

REFERENCES:
patent: 4045128 (1977-08-01), Momiyama

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