Care & Maintenance

Give your telescope reasonable care and it will last a lifetime. When not in use, keep its dust cover on as well as the dust cap on the eyepiece opening. Keep the telescope inside the hard storage carrying case when not in use. Store it indoors or in a dry garage. Do not leave the telescope outside except when using it. The optical tube is aluminum and has a smooth anodized surface that should resist scratches and smudges. If a scratch does appear on the tube, it will not harm the tele- scope. Smudges on the tube can be wiped off with standard household cleaners.

Dew

When you are ready to pack up your telescope at the end of the night, avoid immediately storing it in the hard case if you encountered heavy dew and the telescope is damp. Instead, bring the telescope inside and allow the moisture on the tele- scope to evaporate. If dew forms on the objective lens, then leave the dust cover off of the telescope until all the moisture has evaporated. Once the telescope has completely dried out, place it in the hard case.

Cleaning Optical Surfaces

In general, your telescope will only need to be cleaned on a very minimal basis. Dust particles on the objective lens do not effect the optical quality of your EON. Loose dust can simply be blown off with air, using a compressed air can or blower bulb (available from Orion). Any remaining dust is best left alone, unless the build up is extreme. Finger prints and water marks should be cleaned from your telescope’s objective lens. Any quality optical lens tissue and cleaning fluid spe- cifically designed for multi-coated optics can be used to clean the telescope’s objective lens as well as the lenses of your eyepieces and finder scope. Never use regular glass cleaner or cleaning fluid designed for eyeglasses. Before cleaning with fluid and tissue, however, blow any loose particles off the lens with a blower bulb or compressed air, or lightly brush the lens with a soft camel hair brush. Apply some cleaning fluid to a tissue, never directly on the optics. Wipe the lens gently in a circular motion, then remove any excess fluid with a fresh lens tissue. Oily fingerprints and smudges may be removed using this method. Use caution; rubbing too hard may scratch the lens! Clean only a small area at a time, using a fresh lens tissue on each area. Never reuse tissues.

Specifications

EON 72mm ED Apochromatic Refractor

Optical tube:

Seamless aluminum

Objective lens:

Apochromatic, rear element made

 

of FPL-51 ED glass, air-spaced

Objective lens coating:

Fully multi-coated

Lens cell:

Machined aluminum

Focal length:

430mm

Focal ratio:

f/6.0

Baffles:

2 knife-edge baffles

Focuser:

Dual Speed 11:1 Crayford, accepts

 

1.25" or 2" accessories, brass

 

compression ring

Mounting:

Mounting block, dovetail design,

 

1/4"-20 threaded

Weight:

5.0 lbs./2.27 kg

Length:

12.5"/31.75cm with dew shield

 

retracted

Outside Diameter:

3.43"/87mm

EON 80mm ED Apochromatic Refractor

Optical tube:

Seamless aluminum

Objective lens:

Apochromatic, rear element made

 

of FPL-53 ED glass, air-spaced

Objective lens coating:

Fully multi-coated

Lens cell:

Machined aluminum

Focal length:

500mm

Focal ratio:

f/6.25

Baffles:

Cone baffle

Focuser:

Dual Speed 11:1 Crayford, accepts

 

1.25" or 2" accessories, brass

 

compression ring

Mounting:

Mounting block, dovetail design,

 

1/4"-20 threaded

Weight:

6.5 lbs./2.95 kg

Length:

15.25"/38.74cm with dew shield

 

retracted

Outside Diameter:

3.54"/90mm

EON 120mm ED Apochromatic Refractor

Optical tube:

Seamless aluminum

Objective lens:

Apochromatic, rear element made

 

of FPL-53 ED glass, air-spaced

Objective lens coating:

Fully multi-coated

Lens cell:

Machined aluminum

Focal length:

900mm

Focal ratio:

f/7.5

Baffles:

3 knife-edge baffles

Focuser:

Dual Speed 11:1 Crayford, accepts

 

1.25" or 2" accessories, brass

 

compression ring

Mounting:

Tube rings and dovetail plate

Weight:

14.31 lbs./6.49 kg

Length:

31.25"/79.38cm with dew shield

 

retracted

Outside Diameter:

3.54"/122mm

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Orion #9781 EON 72MM instruction manual Care & Maintenance, Specifications
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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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