Variable imaging mask for delineating the composition of a visib

Details Variable imaging mask for delineating the composition of a visib Variable imaging mask for delineating the composition of a visib

1987-03-27

1988-08-16

Corbin, John K.

Photocopying

Contact printing

Light boxes

350318, 354245, 354296, 355126, G02B 500, G03B 936, G03B 2728

Patent

active

047639890

ABSTRACT:
A portable viewing mask for delineating an image to be recorded or re-composed artistically, photographically or by electro-magnetic means having a variable size viewing aperture. The mask consists of a sheath containing a movable slide which adjusts the size of the viewing aperture. The aperture is positioned with diagonally opposite corners along the sheath's longitudinal centerline. The coincident longitudinal centerlines of the slide and mask sheath result in the maintenance of a constant aperture proportion as aperture size changes. The proportion of the aperture can be any desired ratio and size. In artistic use, the mask is held a determined distance from the viewer's eye and acts both to identify a pleasing composition for recording and to shield unwanted or distracting visual elements from view. In optical recording applications, when calibrated to the user's optics, it yields a field of view identical to the field of view of the appropriate lens seen from the same spot. As a cropping tool it can be used to identify desired sub-images within a previously reproduced image.

REFERENCES:
patent: 2246920 (1941-06-01), Kromholz
patent: 2343015 (1944-02-01), Lewis
patent: 2356668 (1944-08-01), Hineline et al.
patent: 3203334 (1965-08-01), Wilson
patent: 3255666 (1966-06-01), Davis et al.
patent: 3709591 (1973-01-01), Alzmann
Adams,; Ansel, The Camera; New York Graphic Society, Boston, 1980, pp. 104-105.

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