Features 1、2X Magnification: Suitable for astronomical telescopes with a 2in interface, for viewing landscapes and astronomical observations, such as the lunar surface, planets, nebulae, star clusters, dispersion nebulae and other astronomical bodies. 2、Adapter Ring: There is a 2in to 1.25in adapter at the rear interface of the lens, which can freely switch between 2in and 1.25in eyepieces, there is a built in metal spacer to prevent the eyepiece from being scratched by screws during use. 3、Optical Glass: The lens adopts premium optical glass, FMC green film, good light transmission performance and imaging clearly. 4、Matting Treatment: The lens barrel is made of premium metal material, which is sturdy and durable, with internal matting treatment to reduce reflections. 5、Installable Filter Lens: There are threads inside the front interface of the lens, and the filter lens can be installed and used, the screw fixing design makes the connection more stable. Specification Item Type: Barlow Lens Material: Plastic, Metal, Optical Glass Gross Weight: 414g / 14.6oz Lens Coating: FMC Lens Front Port Outer Diameter: 2in Lens Rear Port Inner Diameter: 2in and 1.25in Adapter Ring Interface: 2in to 1.25in Magnification: 2X Package List 1 x Barlow Lens 2 x Dust Cover