Types of telescopes and mounts (image: How stuff works)
The most important aspect of any telescope is its aperture, the diameter of its objective - lens or a mirror. The bigger the aperture the better – image will appear bright and sharp. your telescope should have at least 2.8 inches (70 mm) aperture.
Magnifications depend on the eyepieces you put into telescope. Top useful magnification is 50 times your telescope’s aperture in inches, or twice its aperture in millimeters. How to know the magnification you get from your eyepiece? Simply divide the focal length of the scope by that of the eyepiece.
Pay close attention to the weight of the scope you’re considering buying. A really large scope requires either a permanent observatory or friends to help you assemble it for each observing session.
Telescopes are divided into three types: refractors, reflectors, and catadioptrics.
Read more: Best telescope for beginners
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