Feature: 1. [1.25in Interface] 3X eyepiece lens can be used with astronomical telescope with 1.25in for large field lunar observation, medium sized star cluster, and a wide range of cloudy nebulae and deep space target. 2. [FMC Green Film] Fully coated green coated optical glass eyepieces with excellent image contrast and light transmission for maximum detail and clarity across the entire field of view. Planetary filter enhances details. 3. [3X and Anti Slip] Magnification lens has 3X magnification, making it ideal for enthusiasts with fast, short focal length telescopes. Anti slip and anti jamming design with inward slope to help avoid accidental falls. 4. [Photographic Thread] Telescope eyepiece 1.25 inch eyepiece tube with thread, supports connection to interface adapter with T2 (M42x0.75mm) thread and M35x1mm thread. 5. [Material and Photography Extension] Telescope eyepiece uses aluminum alloy lens body and optical glass lens. Photography Extension: 22mm / 0.87in with M35 mount, 31mm / 1.22in with M42 mount. Specification: Item Type: Magnification Lens Lens Body Material: Aluminum Alloy Lens Material: Optical Glass Magnification: 3X Number of Lenses: 1 Piece Lens Coating: FMC Green Film Interface Size: 1.25in (about 31.7mm) Photographic Thread: Support connection to the interface adapter with T2 (M42 x 0.75mm) thread and M35 x 1mm thread Photography Extension: 22mm / 0.87in with M35 mount, 31mm / 1.22in with M42 mount Anti Slip Design: Anti Slip and Anti Jamming Design with Inward Slope. Package List: 1 x Magnification Lens Note: Please allow some errors due to manual measurement.