| 摘要 |
For controlling emission of light from an outer flash lamp having a light receiving part and externally attached to a camera, which may be a digital camera and may be enclosed inside a watertight housing for underwater photography, having an inner lamp which is provided internally and includes a light emitting part, a filter which passes infrared and near infrared light but prevents visible light from passing through may be attached to the light emitting part of the inner lamp or on the housing of the camera. Light emitted from the inner lamp has sufficiently strong infrared intensity and the portion passing through the filter is sufficiently strong to activate the outer lamp. The filter may be substituted with a light intensity-reducing filter for reducing the intensity of incident light thereon with an amplifier added to the light receiving part of the outer lamp such that the light with reduced intensity through such a filter can activate the outer lamp. A light guide may be used to deflect the forwardly propagating light emitted from the inner lamp and to lead it to the light receiving part of the outer lamp for activating it with a light screening plate provided to screen off the forwardly propagating light from the camera.
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