With its big aperture, it gathers significant light for deep-sky viewing. It has a focal length of 1200mm, providing excellent resolution and magnification. As an achromatic refractor, it does show some color fringing, but it remains excellent for visual observing. The telescope is often used for lunar, planetary, and bright star clusters. Its build quality is sturdy, designed for serious amateur astronomers. The Evostar 150 comes with a 2" dual-speed focuser for precision. Its large size makes it less portable but very powerful. The optics are fully multi-coated for increased performance. This is one of the best large achromatic refractors available for serious visual astronomy.