Check the listing for details. Celestron 1.25 inch Moon Filter - Suitable for Lunar Observation, Extra.... Color: Black, Condition: New, Made in Unknown. Listed at 24.02 USD. It’s an obvious target that’s easy to locate and full of exciting geographical features to explore. The Celestron Moon filter enhances lunar viewing by cutting down on the Moon’s bright glare, improving contrast and making faint details easier to observe.