SP (Super Plossl) Series eyepieces set the performance standard for modern telescope oculars. The proven 4-element Plossl designs display edge-to-edge blackened elements and deliver the highest contrast images attainable. SP series eyepieces minimize spherical abberation, distortion, astigmatism and off-axis colour. Oversize optical elements afford the observer luxurious eye relief. Stray light is eliminated by the fold back rubber eyecups standard with every SP eyepiece. All eyepieces offer a 52 degree field of view.