The this 90mm Cassegrain is part of Celestron’s NexStar line of advanced telescopes. If you’re a beginner, don’t let the word ‘advanced’ scare you. It’s advanced because it has extra features that makes it even easier to use than most computer controlled telescopes. Celestron’s patented SkyAlign technology let’s you align the telescope without any knowledge of astronomy. After that, just use the hand-held controller to automatically Go-To any of 4,000 objects built-in to the telescope’s memory.