| 摘要 |
An adapter ring for mounting a light source on a camera lens tube for close-up photography. The adapter includes means to vary the angle defined by the optical axis of the camera lens and the light beam emanating from the light source, to enable a light beam of appropriate intensity to be directed onto the subject to be photographed from a most favorable angle; alternatively, the adapter may be constructed such that the angle subtended by the light beam with respect to the optical axis of the lens is optimized for a particular camera-to-subject distance. Additional adjustment means are provided to enable the light source to be repositioned to any point on a circle of revolution defined about the optical axis of the camera lens.
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