Sky watcher esprit 150ed 150mm 6 f1050 super apo triplet optical tube assembly we are proud to introduce the new sky watcher professional esprit 3 element ed apochromatic refractor these are instruments of the highest quality with optical performance rivalling or exceeding similar telescopes of even the most famous high end telescope brandsthe esprit super apo triplets are designed for the most demanding astro imagers but are also fine telescopes for visual observations the premium super