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. The SVBONY super 1.25" 40 mm plossl eyepiece engineered with 4 element design and offers a generous 40 degree apparent field of view. It is awesome for perusing the sky and finding things like constellations, clusters, and galaxies in the field of view. The planetary eyepiece has an safety undercut design to prevent the telescope objective lens from slipping out. The field of view of the highly achromatic lens is more realistic, allowing you to see more details. Lens edges are blackened to reduce scattering of stray light and maximize contrast. The built in rubber eye guard enhances viewing by helping to block out ambient light and position no introduction of additional color for higher magnification;highly achromatic 1.25 telescope eyepiece; Effectively reduce chromatic aberration and improve imaging clarity. enhance the details of planetary filters.It can be removed for eyeglass wears and astronomy photography.