Focal Length: 40mm (1.57″)
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 focal length is available at 40mm, 32mm, 25mm, 17mm, 12.5mm, and 10mm. The Apparent Field of View is 52 degrees.