http://www.filmtools.com/4565081ef.html3516Tiffen 4"x5.65" 81EF N3, N6, N9, N1.2http://cdn.filmtools.com/media/catalog/product/8/8/8847-etc.JPG326.65USDInStock/Camera & Accessories/Filters & Accessories/Camera & Accessories/Filters & Accessories/Camera Filters/More/Shop by Trade/Cinematographers/Filters & Accessories<ul>
<li>4" x 5.65" 81EF</li>
<li>Warming Light Balancing Filter</li>
<li>Partial color correction </li>
<li>ND 3 - 1.2 </li>
</ul> The Tiffen 81EF Warming filter has about a one stop loss and is used to warm scenes, or for partial color correction when using tungsten based film outdoors and the desired look is to still have a slight blue cast.