2
WARNING:
Do NOT look at the Sun without a
professionally made solar filter
on the telescope;
serious eye damage may result if you look at the
Sun with any unfiltered optical instrument. Do not
leave the telescope unsupervised around children.
Always cover the lenses when leaving the telescope
in direct sunlight.
Figure 1.
The EON 80 ED Apochromatic Refractor optical tube assembly
Dew shield locking
setscrews (3x)
Fine focus knob
Coarse focus knob
2" accessory
collar
Dovetail finder
base
Tube rings
Retractable dew shield
Objective lens cover
1.25" adapter
Getting Started
The EON 80mm ED comes fully assembled from the factory.
The telescope’s optics have been installed and collimated, so
you should not have to make any adjustments to them.
Please keep the original shipping box! In the unlikely event you
should need to ship the telescope back to Orion for warranty
repair service, you should use the original packaging. The box
also makes a very good container for storing the telescope
when it is not in use.
Attaching the EON 80mm ED to a Tripod or Mount
The EON 80mm ED can be attached to a tripod or mount by
the use of the narrow Vixen style dovetail rail. This dovetail
fits any mount capable of connecting a Vixen style dovetail,
including the Orion AstroView, SkyView Pro, Sirius, and Atlas
mounts. In addition, in the middle of the dovetail plate is a
threaded ¼"-20 hole designed for any standard photo tripod,
so the EON can be connected to any camera tripod capable of
holding the weight of the optical tube.
Machined felt-lined rings are included with your EON, and
come fully assembled and connecting in the box. In addition,
on the top of those tube rings are a series of 6mm (1mm per
thread) mounting holes, designed to connect any auxiliary rail
or other accessory to the top of your telescope.
Use of Optional Eyepieces, Diagonal, and Finder
Scope
The EON 80mm ED does not come with a finder scope, diago-
nal or eyepieces in order to grant the user the greatest versatil-
ity in customizing the instrument to suit their tastes. However,
certain rules for using accessories still apply.
Any Orion finder scope with a dovetail bracket can be used
with the EON 80mm ED. Simply unthread the thumbscrews
on the dovetail mount (
Figure 1
) and insert the assembled
finder scope and dovetail bracket. Retighten the thumbscrews.
Finder scopes that do not use a dovetail bracket will need to be
attached by other means.
The EON 80mm ED can use almost any 1.25" diagonal or eye-
piece. Please note that the telescope will not come to focus
without the use of a diagonal or extension tube. To install a
diagonal, loosen the thumbscrew on the 1.25" adapter (
Figure
1
). Insert the diagonal or extension tube and secure it with
the thumbscrew. Then insert the eyepiece into the diagonal or
extension tube and secure it with the thumbscrew(s).
Use of 2" Eyepieces and Diagonals
A feature of the EON 80mm ED is its ability to also use 2" bar-
rel-diameter eyepieces and diagonals. At low magnifications,
2" eyepieces can give a wider field of view than standard 1.25"
eyepieces. This is especially desirable for observing deep-sky
objects, as many of them appear quite large, but faint. As with
1.25" eyepieces, the EON 80mm ED will not reach focus with
the 2" eyepieces unless a 2" diagonal or extension tube is
used.
To use 2" eyepieces, simply loosen the three large thumb-
screws on the 2" adapter (
Figure 1
). Once these thumbscrews
are loosened, the entire back end of the focuser, including
any 1.25" diagonal and eyepiece that may be attached, comes
