The Celestron Neutral Density Moon Filter - 1.25" is the perfect accessory for your telescope! This filter reduces the brightness of the moon by several f-stops, reducing glare and allowing you to observe the moon in all its glory without the harshness of its natural light. The filter is made from high quality optical glass and features a 1.25" thread so it can be easily attached to most telescopes. With this filter, you can now enjoy the beauty of the moon