1、Universal: 1.25in standard interface, suitable for all 1.25in astronomical telescopes and accessories, built in M28.5x0.6mm thread specification, you can purchase additional astronomical telescope filters as needed. 2、Wide Field of View: Using 2 groups of 4 optical structures, 26MM focal length, 52° large field of view, comfortable viewing, easy to find targets, and can watch a wider range of star, landscape, astronomical, etc. 3、Lens Material: The lens adopts high quality optical glass, FMC coating process, small chromatic aberration, high light transmittance, low dispersion, and clear image. 4、Lens Barrel Material: The lens barrel is made of aluminum alloy, which is sturdy and durable, with internal matting treatment to reduce reflections. 5、Folding Eye Mask Design: It adopts folding eye mask design, which is not easy to get tired after watching for a long time. Item Type: Telescope Eyepiece Material: Aluminum Alloy, Optical Glass Interface Specification: 1.25in Focal Length: 26mm Field Of View: 52° Exit Pupil Distance: 15mm Lens Coating: FMC Optical Structure: 4 Elements In 2 Groups Thread Specification: M28.5 x 0.6mm 1 x Eyepiece 2 x Dust Cover