6.25% Transmission DN filter;ND16 filter transmits only 6.25% of the incoming light; help reduce radiation; reduce deformation between light and dark areas at the edge of the moon; Help you watch the moon comfortably;Let you achieve a sharper image directly | Suitable for watching three-quarter moon ;The 1.25" Neutral Density Moon filter can reduce the amount of light reaching the film without affecting the color; and reduces glare so you can see more lunar detail and surface features with your telescope | Help protect dark-adapted vision;When observing the three-quarter moon; most of the moon's circular surface is bright; At this time; direct observation is likely to damage the eyes; ND16 filter transmits only 6.25% of the incoming light;Can protect your eyes | Durable Material; The included filters are made of HD optical glass; can guarantee a good light transmittance; Aluminum alloy frame sealing ring for better tightness and avoiding fall or loose | Applicable standard 1.25 inch; Metal filter cell threads directly into the 1.25 inch barrel of your telescope eyepiece; Useful for different caliber astronomical telescopes through which the light of the Moon can be extremely overwhelming