Feature: 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