2
tial coordinates (right ascension and declination), which can
be found in many observing books and star atlases.
The Premium 110mm ED refractor can also be easily mount-
ed on altazimuth mounts, like the Orion VersaGo, which utilize
a dovetail holder like Orion equatorial mounts.
Extendable lens shade
The Premium 110mm ED refractor features an extendable
lens shade that can help prevent dew accumulation on the
objective lens as well as block stray light or glare from enter-
ing the telescope. Once you have mounted the telescope,
gently pull forward on the lens shade to extend it. Tighten
the lens shade thumbscrew to secure the lens shade to the
desired position. Be careful to not touch the objective lens.
The lens shade should be retracted during storage or at times
when the telescope is not in use. Remember to loosen the
lens shade thumbscrew before making any adjustments.
use of optional Eyepieces, Diagonal, and
Finder scope
The Premium 110mm ED does not come with a finder scope,
diagonal or eyepieces in order to grant the user the greatest
versatility in customizing the instrument to suit their tastes.
However, certain rules for using accessories still apply.
You can attach an optional Orion finder bracket to the 110mm
ED using the included dovetail mounting base which has
been pre-installed on the optical tube (Figure 2). To attach a
finder bracket simply loosen the knurled thumbscrew on the
side of the bracket, slide the foot of the finder scope bracket
completely into the dovetail and re-tighten the thumbscrew to
secure it into place. Any Orion finder scope with a dovetail
bracket will fit into the dovetail mounting base.
The Premium 110mm ED refractor can use almost any 2"
diagonal and eyepiece. To install a diagonal, unthread the
thumbscrew on the focuser drawtube (Figure 2) until the
internal brass ring is flush with the interior of the drawtube.
Insert the diagonal and secure it with the thumbscrew, which
will compress the brass ring around the inserted barrel of
the diagonal. Then insert an eyepiece into the diagonal and
secure it with the thumbscrew(s) on the diagonal.
the 2" Dual‑speed crayford Focuser
The Premium 110mm ED comes equipped with a dual-speed
Crayford focuser. The Crayford design allows for smooth, pre-
cise focusing without any image shift that typical rack-and-
pinion designs experience.
The focuser features dual-speed adjustment with the fine
focus wheel (Figure 2). This small black wheel allows precise
focus adjustment at a ratio of 11:1, meaning eleven turns of
the fine focus wheel equals one turn of the focus wheel. Use
the focus wheels to achieve rough focus on your target object,
then use the fine focus wheel for the most precise focus in
order to coax out even more image detail. You’ll be amazed at
the amount of detail fine focus adjustments allow you to view
on targets such as the lunar surface, planets, star clusters,
and other celestial objects.
If you find that the focus wheels are too tight or too loose, you
can make adjustments to the drawtube tension by using the
drawtube tension adjustment set screw located on the bottom
of the focuser between the focus wheels. Make adjustments
to this set screw with the provided hex key until the focuser
motion feels comfortable. Please note that you must have at
least some tension applied to the focuser drawtube or else it
will not move when you turn the focus wheels.
Once you have achieved focus, you can lock the focuser in
place by tightening the focus lock thumbscrew located on the
bottom of the focuser between the focus wheels (Figure 1).
Locking the focuser in place can be especially useful for imag-
ing applications. Be sure to loosen the focus lock thumbscrew
before making additional focus adjustments.
The focuser drawtube is labeled with a millimeter scale to be
used as a reference (Figure 2). This scale can be useful to
quickly reach focus on previously viewed objects. When ini-
tially observing (or imaging) an object with the Premium
110mm ED, make a note of the scale position once the object
is in focus. When you view the same object during a different
observing session, you can quickly reach focus by setting the
millimeter scale to the previously noted position.
A useful feature of the focuser is that it can be rotated relative
to the tube. This enables you to customize the orientation of
the focus wheels to the most convenient position. To rotate,
Figure 2.
The 2" dual-speed Crayford focuser
Dovetail
mounting
base
Rotation
lock
thumbscrew
Focus wheel
Fine focus
wheel
Drawtube
thumbscrew
1.25" adapter thumbscrew
Focus
wheel
Figure 3.
The 1.25" eyepiece adapter
Thumbscrew
Millimeter
scale
