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Top Gear for Comets

These top-ranked telescopes and binoculars provide great views of comets and more

Top Astrophotography Gear

Capture stunning photos of starry skies with these imaging telescopes and accessories

Top Planetary & Lunar Telescopes

Explore our nearest neighbors in space with these perfect planetary and lunar telescopes

Top Computerized Telescopes

Take guided tours of the heavens with these computerized models

Featured Article

Globular Cluster M13 and the Elusive Propeller

Globular Cluster M13 and the Elusive Propeller


During the summer, the great globular cluster, M13 is located high overhead for observers in the northern hemisphere, allowing for excellent viewing. Observing this cluster back in 1977 with my 4 1/4-inch f/10 reflector, the most I could see was a moderately bright ball of unresolved stars.

While observing M13 with that small reflector, I was unaware of the three dark lanes cutting into the SE edge of the cluster, called the propeller. I'd never heard of the propeller at that time, and this scope was far too small to see this very faint feature. However, thirty-two years later, in May of 2009 using a much larger telescope, I saw it.

A 10-inch telescope might be considered the minimum aperture required to see this most unique shape. If you have plans to observe the "elusive propeller," a magnification of around 200X seems to be the optimum magnification.

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About Orion Telescopes & Binoculars

Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. And you'll enjoy discount prices by buying your telescope online, direct from Orion. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

Orion binoculars are known for quality optics at a great price. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, and sport and hunting binoculars.

Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Capture breathtaking photos with our affordable astrophotography cameras. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!