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background light spill
Old 08-21-2007, 12:13 PM   #1 (permalink)
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I recently tried to use a large foam core to block a colored background light but still got a rim of it on the model's cheek. The foam core was literally blocking the light not the background as it had to be a full shot.

My thinking is the obvious thing to do is move the model further away. She was 8 feet from the background thought. Anything I'm missing?
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Re: background light spill
Old 08-21-2007, 01:22 PM   #2 (permalink)
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It's a little hard to tell without seeing the setup. My guess is that instead of using a large sheet of foamcore, use a smaller section and move it closer to the light and place it to just block the area needed.

Good luck
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Re: background light spill
Old 08-21-2007, 04:27 PM   #3 (permalink)
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As mentioned already, it is not all together clear what your light setup looked like. Here is a photo of a "poster lighting" type setup that I often use:

Click for larger version
Re: background light spill 


As you can see the "gobo" or "bookend" or "reflector" is blocking the background lights from hitting the model. The model is about 8' from the background in this example. Ideally you wouldn't have white ceilings as in this illustration, but usually that does not add much spill.

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Re: background light spill
Old 08-22-2007, 12:07 AM   #4 (permalink)
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I guess the rim on the model's face (chin) was reflected from the seamless backdrop and was pronounced because it was colored. The foamcore was directly beside the background light at the left and should have been effective. Moving her forward is all I can think of, or reducing the intensity of the light.

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Re: background light spill
Old 08-22-2007, 02:12 AM   #5 (permalink)
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The angle of the background light may be your problem. The "angle of incidence is equal to the angle of reflection". Try changing the angle of the light to one where the light will not bounce back to the model. Also be sure you block off the spill on the floor which you can see extending all the way to the model's position. Also the larger the background light source relative to its distance from the background, the softer the light will be which will reduce the effect of spill hitting the model. But the best solution is to just get the angle right.
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Re: background light spill
Old 08-22-2007, 11:49 AM   #6 (permalink)
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Thanks.
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