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Twist-tight collars
1.25" adapter
Figure 4.
New to this edition of the EON 110 ED are twist-tight 2"
accessory collar and 1.25" adapter with twist-tight collar.
diagonal, field flattener, camera adapter, or other accessories.
To insert an accessory into the collar, first twist the collar coun-
terclockwise to widen the internal compression ring, then insert
your 2" accessory into the collar (or your 1.25" accessory into
the 1.25" collar). Then just twist the collar clockwise until it is
tight. The 1.25" adapter has a tapered barrel, which provides an
even more secure fit into the 2" collar, such that even a slight,
inadvertent loosening of the 2" collar will not result in the 1.25"
adapter slipping out.
Engraved Millimeter Scale on Focuser Drawtube
The drawtube of the EON 110 ED's focuser features a laser-
engraved millimeter scale on top (Figure 5), which aids in pro-
viding repeatable focus. When precise focus is achieved, noting
the value on the scale where the drawtube meets the focuser
Figure 5.
The engraved millimeter scale on the focuser aids in
quickly achieving repeatable focus.
4
housing will allow you to return to approximately the same point,
such as when focusing the same a camera in subsequent imag-
ing sessions. Using the scale can save time compared to find-
ing the focusing point "from scratch."
Focuser Rotation
The focuser on the EON 110 ED has two rotatable components.
The entire focuser can be rotated just behind the tapered collar
where the focuser attaches to the optical tube (see Figure 2).
The second point of rotation is the rotation ring for 2" accessory
collar behind the focus knobs. Both of the rotation mechanisms
have three recessed, slotted screws that must be slightly loos-
ened to permit rotation, as well as a thumbscrew lock.
Why two points of rotation? Rotating the entire focuser will re-
orient the focus knobs to a position that may be more desirable,
depending on your mount setup and what you're observing or
imaging. For instance, this feature can allow you to keep the
focus knobs parallel to the ground no matter how your telescope
is positioned. Rotating the rotation ring for the 2" accessory col-
lar, additionally, may be useful for framing a target object for
imaging.
To rotate the focuser, loosen the rotation lock thumbscrew
(Figure 2) a turn or so counterclockwise. Gently rotate the fo-
cuser to the desired orientation, then lock it in place by turning
the lock thumbscrew clockwise. If you find the focuser is difficult
to rotate, you may have to very slightly loosen the three slotted
screws around the focuser with a small flat-blade screwdriver
(not included). If, on the other hand, you feel too much "play" in
the focuser when the thumbscrew is loosened, you may need to
tighten the slotted screws a bit. You want the focuser to be able
to rotate but without play.
Reaching Focus
Your EON 110mm ED apochromatic refractor must be used with
either a diagonal or extension tube in order for an eyepiece to
reach focus. In most cases, you will be using a 90° star diagonal
for visual use with an eyepiece. A camera will also likely require
a 2" extension adapter to reach focus. An optional 2" field flat-
tener designed for short-focal-length refractors, such as the
Orion Field Flattener for Short Refractors (#8893), can be used
instead of an extension adapter.
Finder Scope Compatibility
Adding an optional finder scope to the EON 110 ED is easy.
The focuser is equipped with a dovetail finder scope base (see
Figure 1) that accepts any Orion finder scope or reflex sight as
well as the Orion Dual Finder Scope bracket (#10145).
Operating the EON 110mm
ED
The EON 110mm ED is a versatile telescope designed for both
high-performance imaging and wide-field visual pursuits. Its fast
f/6 focal ratio and ample 110mm ED optics make it an especially
powerful instrument for imaging with CCD or DSLR cameras.
Now that you have become familiar with the different features
and functions of the telescope, you are ready to begin using
your new telescope outside under a starry sky. Be sure to allow
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