Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4806963 | Aperture decision system for flash photographing In a system for setting the aperture in a camera for flash photography, a minimum aperture is computed in response to parameters such as distance to an object, stroboscopic guide number and film sensitivity. In one embodiment, a predetermined aperture val... | 02/21/1989 |
| 4188104 | Automatic control device for electronic flash A photographic device includes means for automatic control of the quantity of light from an electronic flash by comparing the brightness of a main object to be photographed with the brightness of a sub-object to be photographed, and the shutter of the cam... | 02/12/1980 |
| 4114170 | Flash mechanism for camera A flash mechanism for use with cameras comprising a program shutter, a diaphragm linkage lever, an intermediate linkage lever for a flash illumination device, a distance ring, and an exposure correction member, such as a correction element for the guide n... | 09/12/1978 |
| 4074286 | Automatic exposure control device for a camera including automatic film speed setting means An automatic exposure control device built in a camera body provided with a flash-matic means for controlling the diaphragm aperture when taking pictures with flash light as well as an exposure control circuit for controlling the shutter speed or the diap... | 02/14/1978 |
| 4071850 | Camera lens barrel suitable for flash photography A camera lens barrel suitable for flash photography, wherein flash guide numbers are marked either on the distance adjusting ring or the diaphragm value adjusting ring, is disclosed. The distance adjusting ring and the diaphragm value adjusting ring are s... | 01/31/1978 |
