1、1.25 Inch: 2x magnification with 1.25 inch interface increases the magnification of any 1.25 inch eyepiece and also provides comfortable viewing. 2、2X Magnification: Provides more magnification without reducing the exit aperture on the eyepiece and maintains a comfortable viewing field. Let you better explore the astronomical landscape. 3、Optical Glass: The lens adopts optical glass, FMC green coating. The edge of the lens is fully coated with black matte paint, which can be matte and has a good light transmission performance and clear image. 4、External Thread Specification: M42x0.75mm, suitable for connecting to a camera mount with T2 photography thread, if you don't need an adapter ring, you can also use a M35x1mm thread mount. 5、Internal Thread Specification: M28.6x0.6mm, suitable for connecting 1.25in astronomical telescope filter and astronomical telescope eyepiece accessories. Item Type: Magnification Barlow Lens Material: Aluminum alloy, optical glass Gross Weight: 105g / 3.7oz Magnification: 2X Interface Size: 1.25 inches /31.7mm External Thread Specification: M42x0.75mm Internal Thread Specification: M28.6x0.6mm Lens Coating: FMC Green Coating Matting Treatment: The edge of the lens is fully coated with black matting paint 1 x Magnification Barlow Lens 2 x Dust Cover