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. 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.SVBONY Plossl eyepiece has M28.5x0.6 filters threads. Features a precision made standard 1.25" barrel for any 1.25'' astronomy telecope filters. The 1.25" eyepiece barrel can also be used with any 1.25" telescope, diagonal mirror, barlow lens, and other telescope accessories.