Objective lens system with close object focusing aberration corr

Details Objective lens system with close object focusing aberration corr Objective lens system with close object focusing aberration corr

1977-07-13

1979-08-28

Sacher, Paul A.

350209, 350210, 350216, G02B 962, G02B 960

Patent

active

041659163

ABSTRACT:
An objective lens system, for example of a Gauss or Tessar type is provided having the capability of adequately correcting aberrations even when the lens system is focussed at a relatively close object. The lens system is adaptable for use in cameras and comprises a first lens group including an aperture stop and a second lens group positioned on the image side of the first lens group. The second lens group includes a first lens sub-group of positive refracting power and a second lens sub-group of negative refractive power. The air spaces provided between the first lens group and the first lens sub-group and also between the first lens sub-group and the second lens sub-group are varied to compensate for changes in aberrations resulting from focussing at a relatively close object. More specifically, the first air space is increased while the second air space is decreased when the object distance of the lens system is decreased.

REFERENCES:
patent: 2677989 (1954-05-01), Tronnier
patent: 3524700 (1970-08-01), Eggert et al.
patent: 3883228 (1975-05-01), Betensky

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