2" Orion 13% Transmission Moon Filter Helps reduce the bright glare of the Moon so you can see more lunar detail and surface features with your telescope 2" Moon filter threads directly into the barrel of a 2" telescope eyepiece Especially useful for large aperture telescopes through which the bright Moon surface can be overwhelming Transmits just 13% of the incoming light to your eye, enhancing your view Neutral filter will not alter the natural color of the Moon in your views