Large View: 27MM length, 52 degree large field of view, comfortable viewing, easy to find targets, and can watch a wider range of nebulae, star clusters, landscapes, the of the moon, etc. Metal Lens Barrel: The lens barrel is made of premium metal material, which is sturdy and durable, with internal matting treatment to reduce reflections. Folding Eye Shade Design: This astronomic telescope eyepiece adopts folding eye shade design, and you will not easy to get tired after watching for a long time. Strong Versatility: This telescope eyepiece has 2 inch standard interface, which is suitable for 2inch astronomical telescopes, and can be purchased additionally with astronomical telescope filters as needed. Optical Glass: The lens adopts premium optical glass, FMC coating process, small chromatic aberration, high light transmittance, low dispersion, clear image.