The SVBONY SV131 1.25" Plossl 32mm Eyepiece uses premium optics that are fully multi-coated for crisp images. The folding eyecup lets you view with or without glasses, works well for views of the moon, planets, deep-sky objects and terrestrial observations. It's a great birthday christmas gift. 1.25" Plossl eyepiece is suitable for any 1.25" telescope barlow lens and filter;also supports the installation of other 1.25 inches accessories.Thread size is M28.5*0.6mm,can supports standard 1.25-inch filter adapter installation. Comfortable eye relief. With 19mm exit pupil distance, it is convenient for you to observe for a long time. SV137 barlow lens will give all of your 1.25" telescope eyepiece a power-doubling magnification boost with amazing image quality, provides wonderful performance and sharpness, contrast, see the details of Moon and bands of Jupiter clearly. As the same time the eye relief of eyepiece remains constant. The SV137 barlow lens with FMC film can effectively improve the transmittance of light; ensure clear vision and sharp image. Unique matting ink around the optical lens decrease the entrance of stray light; Internally blackened 1.25" eyepiece barrel to avoid internal reflection and maximize contrast. Internal brass ring that can be hit by the set screw. Used to hold the 1.25-inch eyepiece inside; which allows the barlow lens to be evenly stressed; thus eliminating traces on the barlow lens barrel