1. 50 degrees field of viewing, bigger than the normal Plossl eyepiece.
2. Each glass surface has multiple layers of coating for better Astro-image quality.
3. The edge of the lens is matt blackened to prevent stray light interference.
4. All-metal mirror structure, fine texture, superlative workmanship.
5. Safety undercut milled into the nosepiece to prevent the eyepiece from falling out of the scope focuser.
6. Plossl eyepieces with 25mm and longer focal lengths are good choices for glass wearers.