Retrofocus-type wide-angle photographic lens system

Details Retrofocus-type wide-angle photographic lens system Retrofocus-type wide-angle photographic lens system

Filed on

1974-03-19

Date issued

1976-08-03

Examiner

Corbin, John K.

Other Related Categories

G02B 900

Type

Patent

Status

active

Patent number

039725944

Description

ABSTRACT:
A retrofocus-type wide-angle photographic lens system having a predetermined airspace in said lens system and arranged to be focused for close-up photographing and to prevent aggravation of aberrations by moving a front lens group positioned on the object side of said airspace toward a rear lens group positioned on the image side of said airspace at the same time as advancing the lens system as a whole.

REFERENCES:
patent: 3736049 (1973-05-01), Shimizu
patent: 3748021 (1973-07-01), Tajima
patent: 3748022 (1973-07-01), Tajima

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