Decide the size of the telescope you wish to buy
It has been known that an objective lens system of an apochromatic telescope has a combination of a single positive lens element and a single negative lens element, which are made from lens materials having different dispersion powers. Since the objective lens system of an astronomical telescope has a long focal length, correction of axial chromatic aberration is especially important; in recent years there have been many examples of fluorite or special low-dispersion glass being used to reduce the secondary spectrum of the axial chromatic aberrations.
A telescope focuser allows you to explore the skies and see well beyond the capacity of the human eye. The telescope has certainly come a long way from when Galileo first viewed the craters of the moon in 1609. Now, its possible for anyone to buy a telescope, limited only by their budget. However, there are some things to consider when making such a purchase. Read this eHow to learn more.Buy your telescope from a telescope store or online store. A department store telescope will not have the same quality as one sold by a store that focuses on the instrument.
Join an astronomy club and look through the telescopes that the other members or the club provide. Ask a lot of questions, and learn which intane telescopes perform the best, and which ones the other members prefer. You may find such clubs listed at your local planetarium or museum, or even a department store.Decide the size of the telescope you wish to buy. Generally speaking, smaller telescopes are smaller and are easier to carry as well as less expensive. However, the smaller telescopes do not always come with added features like a computer in which you can punch in coordinates.