Lens system with attachment lens removably attached

Details Lens system with attachment lens removably attached Lens system with attachment lens removably attached

1979-04-09

1982-03-09

Corbin, John K.

350422, G02B 1502

Patent

active

043185924

ABSTRACT:
In the rear of a zoom part consisting of a variator and a compensator, preceded by a focusing lens group, is a relay lens consisting of a front lens group and a rear lens group separated by an air space in which an attachment lens is removably positioned. This attachment lens is of positive power and has a primary principal plane which is dimensioned upon attachment to lie on the object side of a secondary principal plane of the zoom part. In one embodiment, the attachment lens is constructed in the form of a Galilean telescopic system which may include a meniscus lens convex toward the front.

REFERENCES:
patent: 3507555 (1970-04-01), Isshiki
patent: 3970367 (1976-07-01), Tsuji
patent: 4146305 (1979-03-01), Tanaka
patent: 4157211 (1979-06-01), Tanaka et al.

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