Variable angle aperture card

Details Variable angle aperture card Variable angle aperture card

1978-06-07

1979-12-11

Stephan, Steven L.

Geometrical instruments

Straight-line light ray type

Multisight line

33 1K, G01C 300

Patent

active

041775732

ABSTRACT:
A variable angle aperture card includes an elongated flat rule foldable compactly and unfolded to provide a horizontal rule with a longitudinal slot with a slide member having a foldable vertically positionable aperture card thereon with a generally rectangular viewing opening therein of a standard photographic print size, which card is slidably adjustable in the slot. Degree of Acceptance and Equivalent Lens Focal Length scales are adhered to the rule on either side of the slot, so that the aperture card is adjustable to a position thereon properly framing the subject, whereat the photographer reads from the scales the angle of view for different camera formats, and determines which lens must be used to photograph the subject from the position at which the framing was made. The combined rule and aperture card may be folded flat for transportation and storage.

REFERENCES:
patent: 665615 (1901-01-01), Mellen
patent: 685839 (1901-11-01), Heger
patent: 940504 (1909-11-01), Brayton
patent: 2193518 (1940-03-01), Lubin
patent: 2474466 (1949-06-01), Carling
patent: 2669783 (1954-02-01), Hegel

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