Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury, and both high and low pressure sodium vapor lights. In addition, they block unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). As a result, Celestron LPR Filters darken the background sky, making deep-sky observation and photography of nebulae, star clusters and galaxies possible from urban areas.
LPR Filters are not used for lunar, planetary or terrestrial photography.
While blocking unwanted light, Celestron LPR Filters permit the transmission of more desirable wave-lengths. The wavelengths included are hydrogen alpha, hydrogen beta, doubly ionized oxygen and singly ionized nitrogen. This will improve your viewing of emission nebulae, both from urban and rural settings. Some examples of objects that will show improved contrast are: the Orion Nebula, the Rosette Nebula, the North American Nebula, the Veil Nebula and the Helix Nebula.
The latest generation of Celestron LPR Filters is made of high quality, flat, polished optical glass. These units are not laminated! With over 40 layers of coating, these filters are state-of-the-art. They're also protected with a broadband anti-reflection coating to prevent ghosting and to improve contrast. They provide superior performance and contrast over competitive models.
Celestron Product Number: 94126A
