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What's the difference


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#1 PetesPix

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Posted 29 December 2005 - 09:07 PM

What is the difference between CTS and CTO with the exception of a few kelvins and why do gaffers get up set if you put CTO in instead of CTS the grips always say it's the same thing. please educate me
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#2 David Mullen ASC

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Posted 29 December 2005 - 09:21 PM

There's a difference between the particular shade of a color and its ability to change color temperature. A Full CTO and a Full CTS both will change 5500K to 3200K, but a CTS has more yellow in it than a CTO, which has more red in it.

It's the same in camera filters -- you may put a bunch of 85B filters together from different manufacturers and notice some variation in shade. You could also, in theory, correct daylight to tungsten with a Coral filter, or a Decamired filter, but you won't get the same shade, just the correct change in color temperature.

Or using a magenta CCM filter versus a fluoro filter, both of which may be magenta but have different shades -- the fluoro filter may be more optimized for film reproduction of 3200K, just like a 85B filter is optimized for film's response as opposed to a Coral filter, which may be more of an approximation (but close enough to be practical.)

The CTS (Color Temperature Straw) line of gels was created for people who thought that CTO's (Color Temperature Orange) were too reddish in their orange correction. Otherwise, they match in terms of color temperature adjustment (MIRED shift.) So it's just a matter of taste. You may think that an HMI with Full CTS is a better match to a tungsten lamp than when using Full CTO to match.

Edited by David Mullen, 29 December 2005 - 09:22 PM.

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