DESC: The XT10 IntelliScope features exquisite optics: a 10" (254mm) parabolic mirror (1200mm focal length, f/4.7) figured from low-expansion, U.S.-made Pyrex glass for superior thermal stability. It gathers 56% more light than an 8" mirror, reaching stars as faint as magnitude 15. The steel optical tube, now finished in deep bronze metallic enamel, is equipped with a 2" aluminum rack-and-pinion focuser, a navigation knob for easy slewing, a big 9x50 finder scope, and two Sirius Plössl eyepieces.