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Balancing tungsten to sodum vapor


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#1 Matt Irwin

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Posted 29 March 2006 - 03:47 PM

I've got a low budget night shoot coming up that takes place on a pier lined with sodium vapor street lamps. The lamps actually provide a lot of illumination and we want to incorporate them into the shots, so I need to find a gel recipe to balance some tungsten and 3200k flo units to the vapor lights.

Of course the color temp varies among sodium lights; I'm looking for a recipe(s) that will get me in the ball park so I can do some tests.
Any favorites? (We're shooting on an HVX200 in 720)

Thanks,
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#2 Stuart Brereton

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Posted 29 March 2006 - 04:25 PM

Matt,

There is a discussion of gel packs to match Sodium Vapor towards the end of this thread:

click here
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#3 Matt Irwin

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Posted 29 March 2006 - 05:46 PM

Matt,

There is a discussion of gel packs to match Sodium Vapor towards the end of this thread:

click here


Lee Apricot 147 and Rosco Cal Colour Yellow 15, huh? Cool, I'll give it a try. Thanks!
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#4 Stuart Brereton

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Posted 30 March 2006 - 12:44 PM

You should have a look at Michael Nashs' suggestion too. It's a very good match.
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#5 Robert Hughes

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Posted 31 March 2006 - 12:31 PM

But, at the risk of restating the obvious, it is practically impossible to balance sodium vapor light to anything, as the light is a discontinuous spectrum; orange and deep violet only. How can the color temp of sodium light vary between units? Also, from my experience these lights have about as much color as sepia toned b&w. So you probably don't want to match your tungsten and kinoflos to them if you want any color in your foreground.
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#6 Matt Irwin

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Posted 31 March 2006 - 01:58 PM

But, at the risk of restating the obvious, it is practically impossible to balance sodium vapor light to anything, as the light is a discontinuous spectrum; orange and deep violet only. How can the color temp of sodium light vary between units? Also, from my experience these lights have about as much color as sepia toned b&w. So you probably don't want to match your tungsten and kinoflos to them if you want any color in your foreground.

You are correct. I don't plan on white balanceing to the sodium vapors-- I'll be at 3200k. I need to gel certain lights so I can put/enhance those colors where I need them. There will probably be pure 3200 key as well as some motivated blue somewhere to compete with the heavy orange.
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#7 Robert Hughes

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Posted 31 March 2006 - 09:45 PM

Ungelled automobile headlights may be appropriate. Let them go slightly yellow and don't attempt to balance to the sodium lights.

Edited by Robert Hughes, 31 March 2006 - 09:46 PM.

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#8 Stuart Brereton

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Posted 01 April 2006 - 04:36 AM

Matts' original query was that he needed to balance some tungsten units to some sodium vapor ones which were actually in his shot, hence the need to find a gel pack that matched. Although Sodium has a discontinuous spectrum, it is possible to achieve a very close visual match with some the the combinations that have been suggested.
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