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What is a refractor?
Home » Astronomy » Telescopes » What is a refractor?The refractor telescope is one which uses a primary lens at the front of the telescope to collect light and focus it at the eyepiece located on the opposite end of the telescope tube.
This design is often chosen by those who enjoy high power views of earthly subjects, as well as the Moon and planets. Most models provide enough aperture—light gathering ability—to make them very suitable for plenty of other astronomical targets. Small models, such as 60mm, 80mm and 90mm (the diameter of the front lens) are very popular for beginners because they are durable, maintenance free, and offer crisp views.
Because the eyepiece is located at the end of the scope, it is often necessary to use what is called a right angle attachment. This will place the eyepiece in a comfortable location for the viewer, but you will always have to view from the opposite end of the scope. When you look at a refractor, picture it aimed towards the zenith and what position you would have to be in to use it.
While quality small aperture refractors are relatively inexpensive, large ones are not. If you are looking for light gathering ability, remember that a 100mm aperture refractor can cost up to 500% more than a reflector!
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