Orion EON 9925 - Manual (Page 4)

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3. Secure the barrel in place by firmly tightening the
thumbscrew on the 1.25" eyepiece adapter.
To attach a 2" diagonal or extension tube to your telescope:
1. Loosen the thumbscrew on the Crayford focuser’s 2"
eyepiece holder and remove the 1.25" eyepiece adapter.
2. Insert the barrel of your diagonal or extension tube
into the 2" eyepiece holder.
3. Secure the barrel in place by firmly tightening the
thumbscrew.
Finder scope compatibility
The included finder scope dovetail base on the EON 80mm
and 120mm refractors are ready to accept any Orion finder
scope. The EON 72mm does not include a finder scope
dovetail base; however, it is available optionally from Orion
and directly fits the holes in the EON 72mm (Figure 5).
To insert a finder scope onto your EON refractor, slide the
finder scope bracket into the finder scope dovetail base and
secure it in place by tightening the thumbscrew(s) on the dove-
tail base (Figure 6).
operating the Eon
refractor
Now that you have become familiar with the different fea-
tures and functions of your EON refractor, you are ready to
begin using your new telescope outside under a starry night.
The EON refractors are essentially ready to begin observing
with immediately. There is a small period of time where the
internal temperature of the telescope must match the out-
side temperature to obtain the best image quality. This time
period is nearly nominal, taking only a few minutes. Typically,
the EON will have reached outside temperature by the time
the telescope is setup.
Figure 6. Slide the finder scope bracket into the finder scope
dovetail base and secure the locking thumbscrew(s).
1/4"-20 threads
Mounting
block
Dovetail plate
Figure 5. The EON 72mm is compatible with the Orion finder
scope dovetail base.
Holes for optional
finder scope dovetail
base
Figure 7. The EON 72mm and 80mm have a built-in mounting
block ready to connect to a sturdy camera tripod or telescope
mount.
2" Eyepiece holder 1.25" Eyepiece adapter
Brass compression ring
2" Eyepiece
holder
thumbscrew
1.25" Eyepiece
adapter thumbscrew
Figure 4. The EON refractors accept both 1.25" and 2”
accessories. The brass compression rings in the 1.25" eyepiece
adapter and 2" eyepiece holder ensure a secure fit without marking
up the barrel of your accessory.