Vivitar Corporation

Ellis Betensky

An improved optical system for a relatively compact zoom lens of relatively high speed, moderate range, and extending from normal into the telephoto region, the lens being of simple construction and having two lens groups and as few as six elements.

Zoom lens

A zoom lens of the type having equivalent focal lengths varying from substantially less than the diagonal of its image frame to an equivalent focal length at least twice the diagonal of the image frame and having a short front vertex distance. The zoom range may be as great as 5:1, with a field angle in excess of 70 degrees at the widest field position.

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Tel Aviv, Israel

Ellis Betensky