Illumination – Photographic lighting – Measuring or indicating
Patent
1982-05-13
1984-10-23
Nelson, Peter A.
Illumination
Photographic lighting
Measuring or indicating
362 18, 362119, 235 647, G03B 1502
Patent
active
044791690
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.
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Nelson Peter A.
Seeber Joseph G.
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