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Old April 20th, 2009, 09:57 AM   #1
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Color correction gels - Quick Question

If trying to match sun light (coming in from window) I just put the Blue Gel (CTB) on the light (Halogen pepper light). This will basicly match lighting right?
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Old April 20th, 2009, 10:20 AM   #2
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Nominally you want a full CTB to do that. There isn't just one shade and they all bring a tungsten light to a higher color temperature of one or the other value. I think you'll find though, your going to lose a lot of light going that way and a 150w tungsten will be very watered down afterwards.
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Old April 20th, 2009, 10:45 AM   #3
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it's a 600 watt pepper and I also have a 300 as well.
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Old April 20th, 2009, 11:21 AM   #4
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As mentioned elsewhere repeatedly, transmission factor on a Full CTB is around 25% and around 50% on a half CTB
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Old April 20th, 2009, 05:11 PM   #5
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Full CTB will get close to the daylight coming in. If it's later in the afternoon or earlier in the morning and warmer than 5500K, you might could use 1/2CTB if you need more light, since, as mentioned above, full CTB cuts your light output quite a bit. When using full CTB I generally use 1K lights. In most cases I've got by with 1/2 CTB and let the background daylight go just a bit blue.
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