Features:Standard 1.25in interface is compatible for most astronomy telescope. Easy to install and remove.High quality aluminum alloy body is sturdy and solid, long service life, not easy to deform or damage.The lens adopts fully-coated optical glass to enhance the light transmittance and color reproduction.It can provide clear and sharp image and bring scenes in the distance to your front.Perfect for observing scenery, bright celestial observations, nebula and so on.Specification:Condition: 100% Brand NewBrand: DatysonMaterial: Optical Glass + Aluminum AlloyColor: BlackLength: Approx. 7.5cm / 2.9inThread Size: M28 * 0.6mmInterface: 1.25inFocal Length: 40mmCoating: Green FilmWeight: Approx. 120gPacking List:1 * Eyepiece