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04 Aug

Reflector telescope

Posted by Optics Blog Experts on

Now and then I get a call from a customer who is concerned about those lines you sometimes see when you look through the eyepiece of a reflecting telescope – the thin lines that extend across the field of view. I explain that these lines you see in a reflector telescope are caused by the shadow of the “spider” or the arms that hold the small secondary mirror in place at the top of a reflecting telescope. Okay, it seems a bit annoying at first, but after awhile, you don’t notice it and it really does not affect performance to any real extent. In fact, most of the time, you won’t see these lines at all. Overall, it is a very small price to pay for the many advantages of a reflecting telescope, such as largest size for the dollar, color correct images and affordability. These are a few of the reasons that the venerable reflector telescope remains one of the most popular telescope designs in use, today, by both amateur and professional astronomers.

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