The new Sky-Watcher ED refractors contain one element made from ED (Extra-low Dispersion) FPL-53 glass precision manufactured in Japan. This glass greatly minimizes chromatic aberration, provides higher resolution and superior contrast. Colour fringing around objects is virtually eliminated.
The Sky-Watcher PROED80 refractor also features a backlash-free 2" Crayford focuser. The focuser wheels contain brushed-aluminum hubs with ridged rubber grip rings. These ED refractors are ideal for visual applications as well as astro-photography.