Features: The filter will fit all standard sized 1.25" eyepieces and accessories. Reduces glare and improves definition so you can see the moon's features. A high quality eyepiece filter for reducing the brightness of the moon and improving contrast and surface detail. A moon filter really makes a difference and at such a low cost is a must for every astronomer. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent on nebulas. Specification: Brand: Datyson Condition: Brand New Lens Material: Optical Glass Frame Material: Aluminum Alloy Lens Color: Light Purple Shell Color: Black Barrel Diameter: 31.7mm / 1.25in Thread: Standard M28*0.6mm Weight: Approx. 17g Package List: 1 * Moon Filter 1 * Storage Case 1The filter will fit all standard sized 1.25inch eyepieces and accessories. 2Reduces glare and improves definition so you can see the moon's features. 3A high quality eyepiece filter for reducing the brightness of the moon and improving contrast and surface detail. 4A moon filter really makes a difference and at such a low cost is a must for every astronomer. 5Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly.