INSTRUCTION MANUAL
Orion® Premium 110mm
f/7.0 ED Refractor
#9206 Optical Tube Assembly
Tube rings
Extendable
lens shade
Lens shade
thumbscrew
Dovetail
mounting plate
Focus lock
thumbscrew
Figure 1. The Premium 110mm f/7.0 ED Refractor optical tube assembly
Congratulations on your purchase of an Orion Premium
110mm f/7.0 ED refractor optical tube. Your telescope
has been designed with high quality optics and excellent
mechanical construction. The ED glass in the objective lens
means you’ll enjoy images with far less chromatic aberration than those seen in a standard refractor, and the smooth
dual-speed Crayford focuser will make getting sharp images
a breeze. These instructions will help you set up and use
your telescope.
Getting Started
The Premium 110mm f/7.0 ED comes fully assembled from
the factory. The telescope’s optics have been installed and
col limated, 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.
Focus wheel
The box also makes a very good container for storing the telescope when it is not in use.
Mounting the Telescope
The Premium 110mm ED refractor can be mounted on Orion
equatorial mounts using the included tube rings and dovetail
mounting plate. The dovetail mounting plate connects directly
to the equatorial mount’s dovetail holder. The dovetail holder
has two securing knobs to keep the dovetail plate securely in
place. Be sure to loosen these two knobs prior to connecting
the telescope to the mount. While grasping the telescope firmly, place the dovetail mounting plate into the mount’s dovetail
holder and tighten the clamping knobs to secure the optical
tube.
An equatorial mount is desirable for astronomical viewing as
it allows easy manual and/or motorized electronic tracking of
celestial objects as the Earth rotates. Setting circles on equatorial mounts also enable you to locate objects by their celes-
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IN 350 Rev. A 10/08
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 mounted 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 entering 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, precise focusing without any image shift that typical rack-andpinion 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
Rotation
lock
Dovetail
mounting
thumbscrew
Focus wheel
base
Focus
wheel
Millimeter
scale
Fine focus
wheel
Drawtube
thumbscrew
1.25" adapter thumbscrew
Figure 2. The 2" dual-speed Crayford focuser
Thumbscrew
Figure 3. The 1.25" eyepiece adapter
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 imaging 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 initially 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,
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loosen the focuser rotation lock thumbscrew (Figure 2) by a
few turns while holding the focuser steady. Adjust the orientation of the focuser and then tighten the focuser rotation lock
thumbscrew to secure the desired position
Use of 1.25" Eyepieces and Diagonals
If you wish to use 1.25" eyepieces and/or a 1.25" diagonal
with the Premium 110mm ED, the 1.25" eyepiece adapter
is required (Figure 3). 1.25" eyepieces usually allow higher
magnification than 2" eyepieces. This is especially desirable
for high power observation of objects in our solar system such
as the Moon and planets.
To use 1.25" accessories, simply insert the 1.25" eyepiece
adapter into the drawtube as you would a 2" accessory. Be
sure to secure the adapter in place with the thumbscrew on
the drawtube. You can now insert a 1.25" accessory into the
adapter for use.
Calculating Magnification (Power)
It is desirable to have a range of eyepieces of different focal
lengths, to allow viewing over a range of magnifications. To
calculate the magnification, or power, of a telescope, simply
divide the focal length of the telescope by the focal length of
the eyepiece:
Telescope F.L. ÷ Eyepiece F.L. = Magnification
For example, the Premium 110mm ED, which has a focal
length of 770mm, used in combination with a 25mm eyepiece,
yields a power of 30.8x.
770 ÷ 25 = 30.8X
Every telescope has a useful limit of power of about 2x per
millimeter of aperture. Claims of higher power by some telescope manufacturers are a misleading advertising gimmick
and should be dismissed. This means the highest useful magnification for the Premium 110mm ED is approximately 220x.
Keep in mind that at higher powers, an image will always be
dimmer and less sharp (this is a fundamental law of optics).
The steadiness of the air (the “seeing”) will also limit how
much magnification an image can tolerate.
Always start viewing with your lowest-power (longest focal
length) eyepiece in the telescope. After you have located and
observed the object with it, you can try switching to a higherpower eyepiece to ferret out more detail, if atmospheric conditions permit. If the image you see is not crisp and steady,
reduce the magnification by switching to a longer focal length
eyepiece. As a general rule, a small but well-resolved image
will show more detail and provide a more enjoyable view than
a dim and fuzzy, overmagnified image.
Note About Chromatic Aberration
Whenever light passes through one material to another, light
of different wavelengths (color) is bent by different amounts.
This is a problem that plagues refractor-type telescopes, since
light passes through both air and glass to form an image. Most
astronomical objects emit a spectrum comprised of many different wavelengths of light, so each wavelength will be bent
by a slightly different amount when passing through a lens.
This results in each color of light reaching precise focus at a
slightly different point, which reduces image sharpness.
The Premium 110mm ED is designed to minimize chromatic
aberration. The objective lens comprises two individual lens
elements, one of which is made of “ED” (Extra-low Dispersion)
glass, a special type of glass that has superior refractive properties compared to normal types of glass. The use of this ED
glass minimizes the amount of chromatic aberration, resulting
in a cleaner, sharper image compared to that in standard achromatic refractors.
Imaging with the Premium 110mm ED Refractor
The Premium 110mm ED refractor’s f/7.0 optics make it an
excellent choice for astro-imaging. The telescope has been
designed with plenty of inward focus travel. This is a great convenience for many imaging applications which require additional devices, such as off-axis guiders and filter wheels, between
the telescope and camera. Without additional inward focus
travel, these devices would be difficult, if not impossible, to use.
As a consequence of this, extension tubes may be necessary
to reach focus with a camera if no other devices are placed
between the telescope and camera.
Using a digital SLR camera with the telescope requires a
T-ring for your model of camera and a 2" camera adapter. A
2" extension tube may also be required.
To use the Premium 110mm ED with the Orion StarShoot
imaging cameras, an extension tube will generally be required.
No other camera adapters should be needed. Please go to
OrionTelescopes.com for details.
Care & Maintenance
Give your telescope reasonable care and it will last a lifetime.
When not in use, keep its dust cover on as well as the dust cap
for the eyepiece opening. Store it indoors or in a dry garage.
Do not leave the telescope outside when not in use.
Orion offers a foam-lined hard case for the Premium 110mm
ED refractor which is an excellent choice for both storage and
safe transport of the telescope. Please go to OrionTelescopes.
com for details.
The optical tube is aluminum and has a smooth painted surface that should resist scratches and smudges. If a scratch
does appear on the tube, it will not harm the telescope.
Smudges on the tube can be wiped off with standard household surface cleaners.
Any quality optical lens tissue and cleaning fluid specifically
designed for multi-coated optics can be used to clean the
telescope’s objective lens as well as the lenses of eyepieces
and finder scopes. Never use regular glass cleaner or cleaning fluid designed for eyeglasses. Before cleaning with fluid
and tissue, blow any loose particles off the lens with a blower
bulb or compressed air, or lightly brush the lens with a soft
camel hair brush. Apply some cleaning fluid to a tissue, never
directly on the optics. Wipe the lens gently in a circular motion,
then remove any excess fluid with a fresh lens tissue. Oily fingerprints and smudges may be removed using this method.
Use caution; rubbing too hard may scratch the lens! Clean
only a small area at a time, using a fresh lens tissue on each
area. Never reuse tissues.
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Specifications
Objective lens
diameter: 110mm (4.3")
Objective lens: Air-spaced doublet, one element made
of ED glass
Objective lens
coating: Fully multi-coated
Focal length: 770mm
Focal ratio: f/7.0
Lens cell: Machined aluminum
Focuser: Crayford, accepts 2" accessories, dual-
speed focus adjustment, rotatable
1.25" adapter: Included, threaded for 2" filters
Optical tube: Seamless aluminum
Tube interior: 3x baffles, painted flat black
Mounting
provision: Tube rings (2) and dovetail mounting
plate included
Weight: 10 lbs. 1 oz.
Length: 25.1"
Hard Case: Optional
This Premium 110mm f/7.0 ED Refractor is warranted against defects in materials or workmanship for
a period of one year from the date of purchase. This warranty is for the benefit of the original retail purchaser only. During this warranty period Orion Telescopes & Binoculars will repair or replace, at Orion’s
option, any warranted instrument that proves to be defective, provided it is returned postage paid to:
Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076. If the product is not registered, proof of
purchase (such as a copy of the original invoice) is required.
This warranty does not apply if, in Orion’s judgment, the instrument has been abused, mishandled, or
modified, nor does it apply to normal wear and tear. This warranty gives you specific legal rights, and
you may also have other rights, which vary from state to state. For further warranty service information,
contact: Customer Service Department, Orion Telescopes & Binoculars, 89 Hangar Way, Watonsville
CA 95076; (800)-676-1343.
Orion Telescopes & Binoculars
89 Hangar Way, Watsonville CA 95076
Customer Support Help Line (800)‑676‑1343 • Day or Evening
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One-Year Limited Warranty
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