SVBONY Lens 34mm Wide Angle 72° Eyepiece using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings. The edges of the eyepiece lenses are blackened to minimize the scattering of stray light; the entire thread is matte to minimize reflections; enhance your viewing experience. SV136 telescope eyepiece's barrels threaded for use with 2" eyepiece filters (M48.5*0.75). The 34mm focal length lens are optimized to produce high contrast, high resolution, and superior flat field characteristics, always providing high contrast images; very comfortable for observation; suitable for viewing landscapes, bright astronomical observations, nebulae, etc. When the telescope is pointed at or near the zenith (directly overhead), mirror diagonal telescope allows for more convenient and comfortable observation. SV188P uses a high-reflective dielectric coating that can achieve a reflectivity of 99%; more light means you will get brighter pictures. Erect Image. Just like looking in a mirror, the image is correct up and down; left and right are flipped. Brass Compression Ring. The brass pressure ring effectively protects the eyepiece from damage during use.