I have a full set of the Celestron Plossl (Silvertop - all silver with Orange Engraved Lettering - 7.5, 10, 15, 17, 22, 26, 30, 36, 45, 2" 50) that are excellent eyepieces. I also have a full set of the original Naglers (Circle N/J Smoothside 4.8, 7, 9, 11, 13), the 20mm Nagler Type II and the Televue Wide Field 32mm and 40mm (Circle N/J smoothside). In recent history, I also owned a set of the Celestron Volcano Top Orthos (Circle V with Silver Engraved Lettering on volcano slant - 4, 5, 6, 7, 9, 12, 18) which I sold. Mostly because they offered no better performance than the other eyepieces