Skywatcher offers 2- and 3-element ED apochromats from Format. These very popular series offer very good optical performance and are available up to 150mm aperture.
Building on the foundation of the popular Evostar line of doublet ED refractors, Sky-Watcher has developed the all-new Evolux ED series. Designed for the discerning astrophotographer looking for a lightweight scope that still packs a punch. Naturally, Evolux ED models offer excellent performance for visual use too.