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Focus Photo Printable version

https://www.controlbooth.com/wiki/Focus-Photo

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A method used to preserve the artistic integrity of a lighting design on a long running show or any time after the LD has departed.

Each light is the rig is individually turned on, and it's focus photographed. Then, later on, it can be refereed to if a unit must be rehung, replaced or just to unsure its original focus remains unchanged.