anglerfish remote optical trigger (Remote Slave Trigger)
In most underwater photography applications the strobe are mounted on the camera housing with use of articulating arms. This lighting technique yields excellent results. However, to create creative lighting it maybe necessary to place the strobes off camera. To do this a remote slave trigger is used similar to how Pocket-Wizard is used above water. The trigger allows the strobe to be decoupled from the camera, allowing the photographer more control over the lighting.
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Macro snoot application
Macro snoot photography can be quite challenging underwater. In most applications, the snoot is mounted on the camera housing and is adjusted to constantly to provide the desired lighting. If the camera housing is moved slighting the lighting is disturbed and may require adjustment.
By decoupling the strobe from the underwater housing, the photographer can move freely without disturbing the lighting. This allows the photographer to place the lighting and move freely around the subject to capture the best angle and composition.
This technique is typically used in any studio application. Seldom you will a photographer mounting the lighting on the camera. By providing lighting off-camera you can achieve different lighting conditions that add depth and contrast to the image making the image more pleasing to the eye.