Congratulations on your purchase of an Orion® EON™ ED Apochromatic Refractor optical tube assembly. The exceptional optical and mechanical quality of your EON refractor will provide you with a pleasing telescope experi- ence. The ED glass in the objective lens yields extremely sharp, high-contrast images with virtually no color distor- tion compared to a standard refractor. The smooth and fine movement of the dual-speed Crayford focuser allows for easy and precise focusing. These instructions will help you use your EON refractor optical tube assembly.

Focus rotation lock ring

Finder scope dovetail base

(for EON 80mm only)

(for EON 80mm only)

2" Eyepiece

 

holder

 

Dew shield

Mounting block

1.25"

 

Eyepiece

Fine focus knob

adapter

Coarse focus knob

 

Figure 1a. The EON 72mm and 80mm ED Refractor optical tube assembly

Parts List

EON 72mm & 80mm Optical tube assembly

Dust Cover

1.25" eyepiece adapter 2.5mm hex key

Hard carrying case

EON 120mm Optical tube assembly

Dust Cover

1.25" eyepiece adapter Tube rings (quantity 2) Dovetail mounting plate 2.5mm hex key

Hard carrying case

Getting Started

Your EON refractor is fully assembled from the factory. The optics have been installed and collimated, so you do not need to make any adjustments to them.

We recommend keeping all of the original packaging. In the unlikely event you should need to ship the telescope back to Orion for warranty repair service, you should use the origi- nal packaging to ensure the telescope stays intact during shipping.

Take a moment to inspect the telescope and all of its parts.

Tube rings

Tube ring

clamps

Finder scope dovetail base

Dovetail mounting plate

Figure 1b. The additional features of the EON 120mm ED Refractor optical tube assembly

Functions and Features

The EON refractors have several features designed to maxi- mize the use and enjoyment of your telescope. When you have become familiar with all of the functions of your EON refractor, you will be ready to begin using your new tele- scope under the night sky!

Retractable Dew Shield

All EON refractors feature a retractable dew shield which allows the telescope to become more compact for stor- age. The dew shield’s primary purpose is to prevent dew (water condensation) from forming on the lens during cold and humid nights. The dew shield is also useful for reduc- ing glare under unwanted outside lights. To extend the dew shield, remove the optical tube dust cover, then pull the dew shield outward until it stops (Figure 2).

Figure 2. Gently pull the dew shield outward until it stops.

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Orion #9781 EON 72MM instruction manual Parts List, Getting Started, Functions and Features
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#9781 EON 72MM specifications

The Orion #9781 EON 72MM is a premium refractor telescope designed for both amateur astronomers and seasoned stargazers. Renowned for its impressive optical performance and robust build quality, the EON 72MM combines advanced technologies with user-friendly features, making it an excellent choice for those looking to explore the night sky in detail.

One of the standout features of the EON 72MM is its high-quality 72mm apochromatic objective lens. This lens is engineered with exceptional glass quality that minimizes chromatic aberration and maximizes color correction. As a result, users can expect crisp, clear images with true-to-life color representation, allowing for stunning views of celestial objects such as planets, nebulae, and star clusters.

The telescope is equipped with a dual-speed 2-inch focuser, which provides precise control over focusing. This dual-speed design allows users to achieve sharp focus when observing high-magnification targets, making it easier to lock onto and appreciate fine details in distant objects. The EON 72MM also includes a 1.25-inch adapter, providing versatility in the selection of eyepieces.

Another prominent aspect of the Orion EON 72MM is its lightweight construction. Weighing in at just under 5 pounds, the telescope is highly portable, allowing astronomers to easily transport it to remote viewing locations or set it up in their backyard for a quick stargazing session. The telescope also includes a sturdy, adjustable mount that provides stability during use and enhances the overall viewing experience.

In addition to its optical quality and physical characteristics, the EON 72MM boasts impressive build quality with a robust aluminum body. The telescope’s finish is designed to withstand the rigors of transport and frequent use while offering aesthetic appeal. Moreover, with a retractable dew shield, the EON 72MM reduces the chances of dew forming on the lens, ensuring clearer views even during long observing sessions.

Overall, the Orion #9781 EON 72MM is an exemplary telescope that combines portability, excellent optics, and user-friendly features. Whether you're a beginner eager to embark on your astronomical journey or an experienced observer seeking a compact option for rich celestial views, the EON 72MM delivers superb performance and reliability, making it a valuable addition to any astronomer's toolkit.
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