![]() ![]() The first is the aperture, or the diameter of the lens or mirror (D), generally expressed in millimeters.Ī telescope is often described with reference to its aperture and focal length.The Most Important Factors of Your Telescope: Aperture and Focal Lengthīoth refractor and reflector telescopes depend on two main optical parameters to portray their power. This is because a mirror is easier to make than a good refractor objective. While it is not difficult to adjust the reflector mirrors, it can admittedly be confusing for beginners.īut when telescopes get to be a certain size, reflectors come out on top for their cost. A reflector telescope will actually need to be aligned from time to time to get the best image. Is one telescope better than another?īeginners usually opt for refractor telescopes, which are slightly easier to use than reflector telescopes. Illustration: Valentine Dubois – Stelvision. A reflector telescope uses mirrors, which is placed at the back of the optical tube.ĭiagram of how a Schmidt-Cassegrain or Maksutov-Cassegrain telescope works.A refractor telescope uses an optical lens, which is placed at the front of the optical tube.Reflector and refractor telescopes work similarly, though their designs are quite different. It also magnifies the objects observed to reveal details that are invisible to the naked eye (such as the Moon’s craters, Saturn’s rings, etc.).First off, it amplifies the light coming off from the stars and reveals what the naked eye cannot see (for example, a distant galaxy).The optical part of telescope has two roles. These can come with your instrument or be purchased separately. Make sure you carefully consider these different parts before you make your choice, since a good optical tube won’t do much good if the mount is unstable or not very accurate. Your telescope should also be equipped with quality accessories. accessories, the most important being the eyepieces and the finderscope (or red dot finder).a mount, which supports the optical tube and allows it to be turned towards a specific direction.an optical tube, which is the main part of the instrument and creates the images of the stars.Overview of a Telescopeīoth refractor and reflector telescopes include: ![]()
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