Photographic camera with built-in strobo flash light device

Details Photographic camera with built-in strobo flash light device Photographic camera with built-in strobo flash light device

1975-09-12

1977-09-27

Griffin, Donald A.

Illumination

Supported by vehicle structure

Condition responsive

362 3, G03B 1503

Patent

active

040514943

ABSTRACT:
In a photographic camera provided with a built-in strobo flash light device, the distance from the strobo flash tube to the optical axis of the taking lens of the camera is selected within the range of 4.5cm to 6.5cm. In order to prevent the red eye effect in color photography, the guide number of the strobo flash tube is selected within the range determined with respect to the distance from the strobo flash tube to the optical axis of the taking lens in accordance with the following formula; ##EQU1## WHERE GN is the guide number of the strobo flash tube and d is the distance from the flash tube to the optical axis of the taking lens.

REFERENCES:
patent: 3348188 (1967-10-01), Wood
patent: 3383994 (1968-05-01), Bihlmaier
patent: 3851163 (1974-11-01), Stacy
patent: 3852790 (1974-12-01), Robinson
patent: 3866033 (1975-02-01), Stacy et al.

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