The Singh-Ray LB ColorCombo Polarizer Filter blends both the LB Color Intensifier and LB Warming Circular Polarizer into a single filter to provide the benefits of both in a more convenient package.
The LB Color Intensifier aspect is designed to enrich local color contrast in specific regard to warm colors as well as greens. The filter strives to boost the intensity of those specific colors while maintaining a natural rendering of other neutral colors as well as white tones within the scene.
The LB Warming Circular Polarizer portion of the filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. This results in a noticeable increase in the saturation of skies and foliage, as well as clearer imagery when photographing in hazy conditions. A circular polarizer differs from a linear polarizer in that it supports full use of a camera's autofocus and auto exposure functions. Additionally, a warming effect is applied to imagery by imparting a slight red/yellowish hue across the entire image.
The LB designation of this filter stands for "Lighter, Brighter", which refers to the lower optical density of the filter that enables shorter shutter speeds or smaller f/stops to be used when the filter is in place. The brighter design of the filter also enables a brighter viewfinder image to aid in composition as well as improves auto exposure and focusing performance. This filter requires an additional 2 stop exposure for normal results.
This filter features an 84mm-diameter sprocket mount for use with Cokin P filter holders. This design allows you to insert the filter in the slot closest to the lens for minimizing the amount of light between the filter and lens. The sprocket itself is constructed from plastic, while the 72mm-diameter filter substrate is constructed from highly polished glass.