Lens field of view simulator

Details Lens field of view simulator Lens field of view simulator

1979-09-10

1981-08-18

Shepperd, John W.

Geometrical instruments

Straight-line light ray type

Multisight line

33266, 354222, G01B 1100, G03B 1104, G03B 1302

Patent

active

042838606

ABSTRACT:
A lens field of view simulator is provided to allow a photographer to view a desired photographic subject, framed as the subject would be framed viewing it through the field of view provided by a camera with a predetermined focal length lens attached. The field of view simulator includes a central portion having a viewing aperture formed therein through which the user views the subject to be photographed and a plurality of plates, each plate having a lens field of view simulation aperture formed therethrough, each of the plates being hingedly attached to the central portion to allow movement of the plates into and out of register with the viewing aperture in the central portion. Preferably, the entire simulator is fabricated as a single unit and is preferably molded of a lightweight plastic, for example, polyethylene.

REFERENCES:
patent: 2157547 (1939-05-01), Leitz
patent: 2232440 (1941-02-01), De Bisschop
patent: 2247104 (1941-06-01), Takacs
patent: 2446738 (1948-08-01), Briskin et al.
patent: 2543240 (1951-02-01), Hutchinson
patent: 2881684 (1959-04-01), Brohl et al.
patent: 2917968 (1959-12-01), Nojiri
patent: 3011385 (1961-12-01), Frost
patent: 3029720 (1962-04-01), Leitz et al.
patent: 3212422 (1965-10-01), Nerwin et al.
patent: 3981564 (1976-09-01), Hoos
patent: 4122470 (1978-10-01), Loranger et al.
patent: 4177573 (1979-12-01), Boston

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