This doublet refractor from Astro-Tech comes equipped with a 2" focuser of 80mm travel. The optics in this optical tube a spectacular for inhibiting chromatic aberration, in which lens fail to focus colors equally. This means Astro-Tech has picked the best optical equipment to ensure the observor gets the best possible views and images in their stargazing. The accessories make this telescope even more appealing. For instance, the focuser included is 360 degree rotatable, meaning you can position your CCD camera virtually anywhere you please. The barring on the eyepieces also protect your accessories when mounting them.