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Old February 22nd, 2015, 12:00 AM   #1
Join Date: Jan 2013
Location: San Diego, Califonia
Posts: 1,087
Help making a custom CTO

I just realized that the magenta hue from my LED light is being caused by my CTO's. The stock CTO on my LED needs a slight correction in camera of adding green to get it centered on the scope. The light puts out 6000k bare, and needs the same correction at that color temp to be centered. I purchased a set of LEE 626 and 624 CTO's hoping to solve this color issue, but they actually made it worse. Upon further research, the LEE LED "specific" filters CUT green, causing a severe magenta cast that requires several extra steps of correction in camera. I guess Neewer LED's are magenta, not green like the others?

Anyway, looking through LEE's site, and hoping someone could help me select some custom gels based on the following information. The LEE 625 full LED CTO drops my kelvin from 6000k to 3400k. Close enough to 3200k for me, but the 1600k drop doesn't match the 2000k drop indicated on the LEE website. I only mention this because if I simply select a regular CTO based on the kelvin drop listed, it may be different when I try it. I would like as close to 3200k as possible, as I shoot news at night and there are a lot of under 2700k light sources that begin to glow neon orange the farther away from 3200k I am forced to white the camera!

Since I don't know much regarding other factors that affect kelvin on light filters, what rolls should I try to order? Looks like the LEE site site wants me to try a 3/4 + 1/8 CTO combo. If I move the slider to 3400k, it seems OK with the 285 3/4 CTO alone. Since I have to add a tiny amount of green to the bare light, I will also order up a 1/8 + green roll as well.

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Old February 27th, 2015, 11:11 AM   #2
Join Date: Jan 2013
Location: San Diego, Califonia
Posts: 1,087
Re: Help making a custom CTO

Bought a bunch of LEE products. The one that worked PERFECTLY was the LEE 285 3/4 CTO. It brought my 6000K CN304 to exactly 3200k, and the white balance was dead center on the vectorscope, no green or magenta hue! Couldn't be more pleased. It feels really good to use the 3200k preset on my camera, and have car headlights appear white instead of some shade of amber/orange/yellow. Including a frame grab from a scene I shot.
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