Amazon.com : Celestron – Neutral Density Filter for Telescope Eyepiece – Moon Filter Cuts Glare – Great for Venus & Double Stars – 13% Light Transmission – Works with Telescopes That Accept 1.25" Eyepieces : Electronics
Amazon.com : Celestron – Telescope Moon Filter – Eyepiece Accessory – Reduces Moon Glare and Enhances Lunar Crater Details – Great for Full Moon Observing – Works with Any Telescope that Accepts
How Filters Can Better Your View – TelescopesPlus
Celestron 1.25" Neutral Density Moon Filter | High Point Scientific