Orion 05598 1.25-Inch 25 Percent Transmission Moon Filter (Black) A specialty Moon filter especially useful for increasing contrast during waning and waxing crescent phases Allows transmission of 25 percent of incoming light Reduces bright glare reflected off the Moon and boosts contrast and resolution of lunar surface features Metal filter cell threads directly into Orion 1.25 inch telescope eyepiece barrels Provides a brighter view than the 13 percent Moon filter by blocking less light - ideal for use with smaller telescopes