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-   -   Gel to match florescents? (https://www.dvinfo.net/forum/photon-management/54624-gel-match-florescents.html)

Marco Leavitt November 18th, 2005 12:40 PM

Gel to match florescents?
 
Does anyone know of a gel that can make a tungsten fresnel match florescent fixtures?

Richard Alvarez November 18th, 2005 12:56 PM

Marco,

You are looking for "Color Temperature Green" gels, also called CTG as opposed to CTB and CTO for daylight and tungsten. Most of the gel makers carry them.

Marco Leavitt November 18th, 2005 01:36 PM

Thanks. Anyone know a product number? I'm not having any luck searching for CTG at the B&H and Rosco sites.

Mike Cavanaugh November 18th, 2005 03:05 PM

Marco - Give Tom @ Albany theater supply a call. I've been surprised what he has around.

Richard Alvarez November 18th, 2005 04:10 PM

Rosco carries them as 'plus green'

gels.http://www.rosco.com/us/technotes/filters/gam_equiv.asp

Scroll down to bottom. You can, of course, alter your FLOURESCENTS to match your tungstens, in which case you gel the flos with PLUS MAGENTA.(OR "Minus Green"... depending on the brand) Up to you to decide which is easier. (Usually you gel the secondary light source to match the primary... but not always.)

Marco Leavitt November 18th, 2005 06:11 PM

Thanks yet again Richard. You always seem to have the answer to what I'm looking for.

Richard Alvarez November 18th, 2005 06:57 PM

Marco,

Ummm... does that mean I get to add "Guru" to my list of useless appellations?

Glenn Chan November 18th, 2005 10:56 PM

You may also need CTB to get the tungsten up to whatever the florescents are at.

There's a way to calculate how much CTB you need based on the color temperature of the fluorescents. If the lights were specified with chromacity co-ordinates you'd be able to calculate how much plus green you need, but otherwise just match things up by eye (and look on a color monitor or in the viewfinder).


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