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Compare refractive and reflective telescope designs. According to Acton Astro, refractive models are best for viewing fairly clear objects, such as the moon or other planets. With this type of large and bright object, refractive units provide the best contrast and detail. Reflective models are better for viewing faint objects, including clusters of stars or distant galaxies. The reflective model collects light better than a refractive model, creating the clearest view of dim objects.
Narrow your selection based on aperture. The aperture of a telescope represents the size of the lens, with larger lenses providing the brightest and clearest views. According to Aquila Optical and Electronics, novice telescope users should look for a 60 mm refractive lens, or 114 mm reflective lens. More advanced users should look for an aperture of between 80 and 90 mm for refractive lenses, and at least 150 mm for reflective lenses.
Inquire about mounting options. According to Acton Astro, telescopes may use one of three different mounting mechanisms. Altazimuth mounts are the easiest to use, and are best for beginners. Dobsonian mounts are the most stable way to support very large telescopes, and equatorial mounts offer the most flexibility for advanced users. Some equatorial mounts even use motorized operating systems for more precise positioning.
Consider portability. If you'd like to be able to take your telescope outside often, choose a lightweight model that's easy to set up and transport. Larger models are less portable, but typically provide a better viewing experience.
Pick a quality unit that feels sturdy in your hands, turns smoothly on its base and stays in position once you set it. Cheaper models are often less steady than higher-quality units, and less likely to move the way you want them to.
Ask your telescope supplier what's included with each model. Look for things like tripods, carrying cases or extra eyepieces and lenses.