Registers – Calculators – Photographic
Patent
1981-03-05
1982-11-30
Hix, L. T.
Registers
Calculators
Photographic
235 70A, G06C 300, G06G 106
Patent
active
043617522
ABSTRACT:
An apparatus for macrophotograph comprising a camera, an electronic flash unit having a variable power output, a bracket for connecting the electronic flash unit to the camera in such manner that an angle formed between an axis passing through a lens of the camera and an axis passing through the flash unit is adjustable, and a calculator device for calculating an appropriate power setting for the flash unit. The calculator device has a first set of indicia for determining the reproduction ratio between the size of the object being photographed and the size of an image of the object on film, a first set of cooperating scales for adjusting actual film sensitivity to obtain an effective film sensitivity based on the reproduction ratio, a second set of cooperating scales correlating the effective film sensitivity with the f-stop or lens opening, and a third set of cooperating scales correlating the flash to subject distance with different power outputs of the flash unit. The second and third sets of scales are positioned on the calculator device in such manner that variation of the relationship between the scales of one of the sets automatically varies the relationship between the scales of the other of the sets. The calculator device is effective to determine appropriate power settings for both macrophotography and fill flash at close distances.
REFERENCES:
patent: 2045797 (1936-06-01), Presser
patent: 2234336 (1941-03-01), Edmunds
patent: 2437774 (1948-03-01), Willcox
patent: 2532892 (1950-12-01), Clark
patent: 2857807 (1958-10-01), Norwood
patent: 2870670 (1959-01-01), Norwood
patent: 2978949 (1961-04-01), Seeger
patent: 3329337 (1967-07-01), Koch
patent: 3903397 (1975-09-01), Yata et al.
patent: 4104510 (1978-08-01), Miyashiro
Article "Adventures in Color-Slide Photography", Eastman Kodak Company, 1976.
Hix L. T,.
Tarcza Thomas H.
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