Pinhole camera with adjustable focal length

Details Pinhole camera with adjustable focal length Pinhole camera with adjustable focal length

1990-09-14

1991-06-11

Mathews, A. A.

354288, 3542891, G03B 1332, G03B 1702

Patent

active

050236415

ABSTRACT:
The invention pertains to cameras and more particularly to pinhole cameras. A method is provided whereby the focal length of a pinhole camera may be adjusted by varying the distance between the pinhole, functioning as the lens, and the photographic paper, serving as film. This adjustment may be made by the user any time before exposure.

REFERENCES:
patent: 1298312 (1919-03-01), Earle
patent: 1366158 (1921-01-01), Brown
patent: 2143385 (1939-01-01), Platt
patent: 2559214 (1951-07-01), Fried
patent: 2751825 (1959-06-01), Fried
patent: 2789490 (1957-04-01), Kaufman
patent: 3640195 (1972-02-01), Zimmermann et al.
patent: 4256392 (1981-03-01), Stemme et al.

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