Gel to match florescents? at DVinfo.net

Marco Leavitt · November 18th, 2005, 12:40 PM

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).

November 18th, 2005, 12:40 PM	#1
Marco Leavitt Inner Circle Join Date: Jul 2002 Location: Albany, NY 12210 Posts: 2,652	Gel to match florescents? Does anyone know of a gel that can make a tungsten fresnel match florescent fixtures?

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November 18th, 2005, 12:56 PM	#2
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	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.

November 18th, 2005, 01:36 PM	#3
Marco Leavitt Inner Circle Join Date: Jul 2002 Location: Albany, NY 12210 Posts: 2,652	Thanks. Anyone know a product number? I'm not having any luck searching for CTG at the B&H and Rosco sites.

November 18th, 2005, 03:05 PM	#4
Mike Cavanaugh Major Player Join Date: Dec 2003 Location: Albany NY Posts: 311	Marco - Give Tom @ Albany theater supply a call. I've been surprised what he has around.

November 18th, 2005, 04:10 PM	#5
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	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.)

November 18th, 2005, 06:11 PM	#6
Marco Leavitt Inner Circle Join Date: Jul 2002 Location: Albany, NY 12210 Posts: 2,652	Thanks yet again Richard. You always seem to have the answer to what I'm looking for.

November 18th, 2005, 06:57 PM	#7
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	Marco, Ummm... does that mean I get to add "Guru" to my list of useless appellations?

November 18th, 2005, 10:56 PM	#8
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	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).