Focal Length: 17mm (0.67″)
Apparent Field of View (deg): 52°
Barrel Size: 1.25″ (31.7 mm)
Sky-Watcher presents its SP series (Super Plössl) as affordable eyepieces for amateur astronomers to start out with. The proven 4-element Plössl design delivers edge-to-edge blackened elements for high contrast and gives generous eye-relief. SP series eyepieces minimize spherical aberration, distortion, and astigmatism. The off-axis color white oversize optical elements afford the observer luxurious eye relief. Stray light is eliminated by the fold back rubber eye-cups and all but the smaller 10mm model features rubber grips. The Apparent Field of View is 52 degrees.