The best telescope for you depends on what you want to use it for and what your observing capabilities are. Some are cheaper, some are simpler to operate, some are more portable, some magnify better, etc. Different types each have their own advantages and disadvantages. What is the best type of telescope? There is no 'best' type of telescope, just as there is no 'best' type of automobile. Types of reflectors include Newtonian, Cassegrain, and Schmidt-Cassegrain. A telescope with an objective mirror is called a reflector. What types of telescopes are available?Ě telescope with an objective lens is called a refractor. Contrary to popular opinion, most observing is done using relatively low power this provides a wider field of view, making it easier to locate your target object. Thus, the magnification can be varied by changing eyepieces: a shorter focal length eyepiece will yield higher magnification. How big will a telescope make things appear? The magnifying power of a telescope is found by dividing the focal length of the objective by the focal length of the eyepiece. Telescopes with longer focal lengths will usually have longer tubes and will provide higher magnification for a given eyepiece. (Of course, larger aperture telescopes are usually more expensive.) Another 'size' of a telescope is the focal length of the objective - the distance required to bring parallel light rays to a focus. In general, the larger the aperture, the more light the objective will gather and the better the images will be. This number is usually given in inches - an 8-inch telescope will have a tube that is 8 inches in diameter (not 8 inches long). The principal way is to state the aperture - the diameter of the objective. What size telescope is best? There are different ways to rate the size of a telescope. The telescope also contains an eyepiece, a small lens that acts as a magnifying glass to enlarge the image created by the objective. How does a telescope work? The telescope contains an objective, a large lens or mirror that acts as a big light funnel, collecting light and bringing it to a focus. The telescope makes the objects appear brighter and, except for stars, also makes the objects appear larger. Because these objects are very far away, they usually appear to be rather small and are often very faint. The Answers: What does a telescope do?Ě telescope is used to observe objects in the sky. How can I look at the sun through a telescope?Ĭan I use a telescope to look at objects on the Earth too? What should I look for when I buy a telescope? What will I be able to see through a telescope? How big will a telescope make things appear? Minnesota State University, Mankato The Questions: What does a telescope do? James Pierce Emeritus Professor of Astronomy Telescope Questions & Answers Telescope Questions & Answers by Dr.
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