Wide-angle attachment for varifocal objective

Details Wide-angle attachment for varifocal objective Wide-angle attachment for varifocal objective

1976-08-05

1978-08-29

Clark, Conrad J.

350187, 350257, 354295, G02B 1518, G02B 702

Patent

active

041100050

ABSTRACT:
A varifocal object selectively focusable upon a normal range of object distances and a substantially shorter macro range can be supplemented by a negative component of one or more lenses whose focal length is less than the depth of the macro range and which forms a virtual image of a nearby object on the object plane of the objective when the latter is adjusted to a predetermined closeup position. A correlating linkage between a seat for the supplemental component and a control member designed to establish the closeup position serves to index the control member in that position or to prevent the emplacement of the supplemental component if the objective is in a different position.

REFERENCES:
patent: 2559844 (1951-07-01), Bennett
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 3997245 (1976-12-01), Uesugi

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