Ellis I. Betensky

4 related patents across 4 interactive lens diagrams.

Biography

Ellis I. Betensky is an American optical designer associated with Opcon Associates and a major contributor to the original Vivitar Series 1 program. His photographic designs used coordinated moving lens groups to preserve correction while focusing at unusually close distances, helping make continuous macro focusing a signature Series 1 feature. His wider published and patented work covers zoom, projection, binocular, and electronic-imaging optics across several decades of computer-aided lens design.

Sources: Vivitar — The Evolution of the 70–210 mm Series 1 Lens Design · Optica — Aberration correction and desensitization of an inverse triplet objective lens

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Group by

Kino Seimitsu Kogyo K.K.(1)

Ponder & Best, Inc.(1)

Vivitar Corporation(2)