| 摘要 |
A photographic flash unit having a plurality of pivotable louvers mounted at the open face of the unit housing. The unit is provided with a mechanism for adjusting the position of the louvers to control the amount of light emitted by the unit during flash operation, and a mounting member for detachably connecting the flash unit to a camera. The unit also has a manually-operable trim device for producing an overall shift in the adjusting mechanism and subsequently in the degree of light output of the flash unit. The camera has a distance setting element which cooperates with the adjusting mechanism of the flash unit to vary the light output of the flash unit as a function of the distance of the subject from the camera. The manually-operable trim device permits the operator of the camera to produce an overall shift in the degree of light output of the flash unit at any given setting of the distance setting element of the camera.
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