Haida M15 Magnetic Nano-coating Clear-Night - HD4366 - Designed specifically to fit the larger 150mm M15 Holder System to make changing filters fast and easy, resulting in less down time for swapping filters - Reduces light pollution in nighttime photography, producing images with true-to-life colors and improved contrast - Reduces the appearance of light pollution in images or video that include the night sky and minimizes illumination from artificial light sources - Absorbs the yellow light from sodium-vapor, mercury-vapor, and Low CRI LED lamps—the three most common sources of light pollution in urban areas - Enhances the visibility of astronomical objects Increases definition and contrast of artificial light sources while minimizing glare 1.25x filter factor reduces exposure by 0.3 stops Constructed from optical glass for clarity Aluminum alloy filter ring for durability and light weight Plastic filter case for storage and transport