Celestron revolutionised enthusiast astronomy with the first mass-produced Schmidt-Cassegrain reflectors. The Schmidt-Cassegrain is a popular design because of its quality compared to its size. Because the light bounces off a number of mirrors internally, it can deliver the quality of a substantially larger refractive telescope in a squat form factor that is easily transportable.

The latest Schmidt-Cassegrain telescopes now offer near professional levels of quality. The Celestron C9 1/4-SGT is a 235 mm reflector with a computer-controlled tracking mount. It stores the locations of more than 40,000 celestial bodies, with space for 200 user-defined objects.

It's also available with a GPS attachment that allows for quick positioning and tracking without needing to calibrate the computer to your current location.