Feature:1. 1.25 Inch: The bottom of the eyepiece features a light dampening thread that can be rotated, allowing for use with 1.25 inch filters and compatibility with standard 1.25 inch interface telescopes or light filters.2. Long Focal Length: With a 40mm long focal length, this eyepiece provides a wide field of view and superior performance for low to medium magnifications. The soft rubber eyecup offers comfort and increased contrast.3. Multi Coated Optics: The eyepiece is equipped with high definition, multi coated lens elements consisting of 2 groups and 4 layers. The optical glass provides maximum brightness and clarity for optimal viewing.4. Aluminum Alloy Construction: The eyepiece features a full metal body made of premium aluminum alloy with a full surface multi layer coating, ensuring excellent optical performance and long lasting durability.5. Versatility: Suitable for both terrestrial and celestial observations, this eyepiece is compatible with all telescopes with a 1.25 inch interface. It is ideal for observing the lunar surface, planets, nebulae, star clusters, and diffuse nebulae, providing high brightness, a large field of view, and a comfortable viewing experience.Specification:Item Type: Telescope EyepieceMaterial: Aluminum alloy, optical glassWeight: Approx. 155g or 5.5ozInterface Size: Approx. 1.25in or 31.7mmFocal Length: 40mmLens Structure: PLOSSLCoating: Full surface broadband coating green film.Package List:1 x Eyepiece1 x Storage Box