Fine control color temp. gels

[john_feggerty]

<p>I would need to balance colour temperature of few flashes and would be looking fine tune written gels 80, 80a, 81 and 81a to place in front of the flash head. <br>

Lee has pre cut set for sale at B&H and I have found some on Ebay as well but if anyone could point other place to find those maybe in Europe. Size should be about 15-20cm if possible. <br /><br />Thanks.</p>

[howard_m]

<p>just buy some sheets of Rosco Cinegel or european equiv.</p>

[ellis_vener_photography]

lighting gels for warming up the color balanced are in the CTO and Straw groups

 

Lights gels for cooling light are in the CTB group.

 

All come in 1/4, 1/2, and full strength. They can be layered for finer control.

 

Always leave some space for air to circulate between the flash and the gel, unless the lights are in a softbox in which

case you can put them right in front of the diffuser on the front of the softbox.

[pete_s.]

<p>Best gels for fine tuning color correction is the <strong>Calcolor gels</strong> from rosco. They have a much more controlled spectral response than CTO/CTB gels.</p>

<p>They are available in a kit with 12"x12" sheets (30x30 cm) where you have everything you need (33 sheets).<br /> http://www.rosco.com/filters/filterkit_calcolor.cfm</p>

<p>You use them very similar to how white balance works on a camera. You simply adjust the red, green and blue components of the light with the different sheets. For instance a red 30 gives you a little more red in your light while a cyan 30 subtracts red (since it consists of green and blue).</p>

<p>You can even figure out exactly what filters you need to match several light sources by taking a custom white balance under each light with your camera. Then you use the Red gain and blue gain values from your exif camera file to calculate exactly what CC filters you need for a perfect match.</p>

<p>You can get them anywhere they sell rosco. It doesn't have to be a shop for photographers, it could also be a supply for theater or film work.</p>

[rodeo_joe1]

<p>Wratten filters are camera filters, not lighting filters ... and good luck finding a Wratten 80 and 81, because there are no such filters. Just 80A, 80B, 80C, 80D and 81A, 81B, 81C, 81D and 81EF.</p>

<p>In any case "fine tuning" is hardly what I'd call the shift from any of the Wratten 80 series. They're classified as colour conversion filters, such as from 3200K Tungsten lighting to daylight. As Ellis says, fine shifts of lighting colour are usually done with CTO or CTB gels, or by Mired shift filters, or CC (colour correction) filters.</p>

<p>The CTO, CTB and other conversion gels that Lee supply can be seen here: http://www.leefilters.com/lighting/technical-list.html<br>

Lee have a major office in the UK, which for the time being at least is part of Europe.</p>

[studio460]

<p>In addition to Lee's CTO/CTB (i.e., "color-temperature orange"/"color-temperature blue") conversion gels, Lee also makes an array of "plus-green" and "minus-green" gels with indicated "CC-equivalent" values. Certain Lee CC gels are sometimes useful for "fine-tune" correction of certain LED panels (e.g., Lee "quarter-minus green," which appears as a light-colored magenta gel). Rosco Cinegel CTO/CTB swatchbooks do include Mired-shift data, but are essentially sold in the same values as the Lee equivalents using the same nomenclature (e.g., 1/8th, 1/4, 1/2, 3/4, full).</p>