Do not rush to the most expensive and "fancy" models. Start simple. Let it be a simple telescope, in which both you and your child will easily understand. If your child has long loved astronomy classes, then it's time to discuss the purchase of a professional telescope for a child.
Look in the lens. The principle of selecting a telescope for a child is simple: the detail of objects is directly proportional to the size of the lens. The lenses of all telescopes are measured in millimeters and in inches. Large lenses will open the eyes invisible to the eye and body of the nebula.
The size of the eyepiece associated with the magnification of the telescope. For a child the best would be a telescope with a magnification over 10x, a telescope with a magnification of 45 times, you can give the high school student. The latter will give the opportunity to see close to the moon.
Take the telescope with the Barlow lens in the kit. It is installed in front of the eyepiece, and the magnification of the telescope is increased by 2 times.
As a child's first telescope to optimally choose 40-90 ml of a telescope-refractor, higher rates make the cost of baby telescopes above.
Children's telescopes is not just lightweight and simplified version of the adult professional telescope. Children's telescopes are still safe to use for young astronomers!