2
Figure 1a.
The EON 72mm and 80mm ED Refractor optical
tube assembly
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.
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.
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).
Focus rotation lock ring
(for EON 80mm only)
Finder scope dovetail base
(for EON 80mm only)
Dovetail mounting plate
Tube rings
Finder scope
dovetail base
Tube ring
clamps
2" Eyepiece
holder
1.25"
Eyepiece
adapter
Coarse focus knob
Fine focus knob
Mounting block
Dew shield
Figure 2.
Gently pull the dew shield outward until it stops.
Figure 1b.
The additional features of the EON 120mm ED
Refractor optical tube assembly
