ORION Images Explorer 9029 User manual

IN 113 Rev. D 05/05
Providing Exceptional Consumer Optical Products Since 1975
Customer Support [phone]
E-mail: [email protected]
Corporate Offices [phone]
P.O. Box 1815, Santa Cruz, CA 95061
INSTRUCTION MANUAL
Orion®Explorer™
Altazimuth Refractors
#9029 90mm model
#9994 80mm model

2
Figure 1. The Explorer altazimuth refractor (90mm model shown).
Tube ring mounting plate
Azimuth lock
knob (not shown)
Accessory tray
Tripod leg lock knob
Piggyback camera adapter
Tube mounting rings
Finder scope
Finder scope bracket
Alignment screws (2)
Eyepiece
45˚ Correct-image
diagonal
Focus knob
Azimuth slow-motion control
Altitude slow-motion control
Accessory tray
bracket attachment point
Accessory tray bracket

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Table of Contents
1. Parts List...................... 3
2. Assembly ..................... 3
3. Aligning the Finder Scope ........ 4
4. Using Your Telescope ............ 5
5. Astronomical Viewing ............ 6
6. Care and Maintenance ........... 7
7. Specifications .................. 8
These instructions will help you set-up, properly use, and
care for your telescope. Please read them over thoroughly
before getting started.
1. Parts List
Qty. Description
1 Optical tube assembly
1 Altazimuth mount
3 Tripod Legs with mounting screws
1 Accessory tray w/mounting hardware
1 Accessory tray bracket
2 Optical tube mounting rings (located on optical tube)
2 Slow-motion control cables
1 25mm (36x) eyepiece (1.25")
1 10mm (91x) eyepiece (1.25")
1 45° correct-image diagonal (1.25")
1 6x26 correct-image finder scope
1 Finder scope bracket
1 Objective lens dust cap
2. Assembly
Carefully open all of the boxes in the shipping container.
Make sure all the parts listed in the parts list are present.
Save the boxes and packaging material. In the unlikely
event that you need to return the telescope, you must use
the original packaging.
Assembling the telescope should take only about 30 minutes.
All screws should be tightened securely to eliminate flexing
and wobbling, but be careful not to over-tighten or threads
may strip. No tools, other than the ones provided, are need-
ed. Refer to Figure 1 during assembly.
During assembly (and anytime, for that matter), do not touch
any of the lenses of the telescope, finder scope, or eye-
pieces, or the mirror of the diagonal, with your fingers. The
optical surfaces have delicate coatings on them that can be
damaged if touched inappropriately. Never remove any lens
assembly from its housing for any reason, or the product
warranty and return policy are void.
1. Lay the altazimuth mount on its side. Attach the tri-
pod legs one at a time to the mount using the screws
installed in the tops of the tripod legs. Remove the
screw from the leg, line up the holes in the top of the
leg with the holes in the base of the mount, and reinstall
the screw so it passes through the leg and the mount.
A washer goes between the screw head and the tripod
leg, and between the wingnut and tripod leg. Tighten the
wingnuts only finger-tight, for now. Note that the acces-
sory tray bracket attachment point on each leg should
face inward.
2. Tighten the leg lock knobs at the base of the tripod legs.
For now, keep the legs at their shortest (fully retracted)
length; you can extend them to a more desirable length
later, after the scope is completely assembled.
3. With the tripod legs now attached to the altazimuth
mount, stand the tripod upright (be careful!) and spread
the legs apart enough to connect each end of the acces-
sory tray bracket to the attachment point on each leg.
Use the screw that comes installed in each attachment
point to do this. First remove the screw, then line up one
of the ends of the bracket with the attachment point and
reinstall the screw. Make sure the accessory tray bracket
is oriented so the ribs in its plastic molding face down-
ward.
4. Now, with the accessory tray bracket attached, spread the
tripod legs apart as far as they will go, until the bracket is
taut. Attach the accessory tray to the accessory tray
bracket with the three wingnut-head screws already
installed in the tray. This is done by pushing the screws
up through the holes in the accessory tray bracket, and
then threading them into the holes in the accessory tray.
Congratulations on your purchase of a quality Orion telescope. Your Explorer altazimuth refractor is an excellent
instrument for both terrestrial observation and astronomical viewing. Whether it’s a distant ship at sea, a bird across a field, or
a planet in the sky, the Explorer will bring you closer to what you wish to observe. If you have never used a telescope before,
we would like to welcome you to a new world of adventure. With a little practice and patience, you’ll find your telescope to be a
never-ending source of wonder, exploration, and relaxation.
WARNING: Never look directly at the Sun
through your telescope or its finder scope—
even for an instant—without a professionally
made solar filter that completely covers the front
of the instrument, or permanent eye damage
could result. Young children should use this
telescope only with adult supervision.

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5. Next, tighten the screws at the top of the tripod legs, so
the legs are securely fastened to the altazimuth mount.
Use the larger wrench and your fingers to do this.
6. Attach the two tube mounting rings to the altazimuth
mount using the hex-head screws that come installed
in the bottom of the rings. First remove the screws,
then push the screws, with the washers still attached,
up through the holes in the tube ring mounting plate (on
the top of the mount) and rethread them into the bottom
of the tube rings. Tighten the screws securely with the
smaller wrench. Open the tube rings by first loosening
the knurled ring clamps.
7. Lay the telescope optical tube in the tube rings at about
the midpoint of the tube’s length. Rotate the tube in the
rings so the focusing knobs are on the underside of the
telescope. Close the rings over the tube and tighten the
knurled ring clamps finger-tight to secure the telescope
in position.
8. Now attach the two slow-motion cables to the altitude
and azimuth worm gear shafts of the mount. Position the
thumbscrew on the end of each cable over the indented
slot on the worm gear shaft, then tighten the thumb-
screw.
9. To place the finder scope in the finder scope bracket,
first unthread the two black nylon thumbscrews until
the screw ends are flush with the inside diameter of the
bracket. Place the O-ring that comes on the base of the
bracket over the body of the finder scope until it seats
into the slot on the middle of the finder scope. Slide the
eyepiece end (narrow end) of the finder scope into the
end of the bracket’s cylinder opposite the alignment
screws while pulling the chrome, spring-loaded tensioner
on the bracket with your fingers (Figure 2b.) Push the
finder scope through the bracket until the O-ring seats
just inside the front opening of the bracket cylinder. Now,
release the tensioner and tighten the two black nylon
screws a couple of turns each to secure the finder scope
in place.
10. Insert the “foot” of the finder scope bracket into the
dovetail holder on the top of the focuser. Lock the brack-
et into position by tightening the thumbscrew on the
holder.
11. Insert the chrome barrel of the 45° correct-image diago-
nal into the focuser drawtube and secure with the thumb-
screw on the drawtube.
12. Insert an eyepiece into the diagonal and secure it in
place with the thumbscrew on the diagonal. (Always
loosen the appropriate thumbscrew before rotating or
removing the diagonal or an eyepiece.)
3. Aligning the Finder Scope
The Explorer refractors come with a 6x26 correct-image
finder scope. (The 6 means six-times magnification, and the
26 indicates a 26mm aperture.) The finder scope makes it
easier to locate the subject you want to observe in the tele-
scope, because the finder scope has a much wider field of
view. Unlike most finder scopes, images viewed in the cor-
rect-image finder scope will appear properly oriented (same
as the naked eye), which makes finding objects even easier.
Before you use the finder scope, it must be precisely aligned
with the telescope, so they both point to exactly the same
spot. Alignment is easiest to do in daylight, rather than at
night under the stars. First, insert the lowest-power (25mm)
eyepiece into the main telescope’s focuser. Then point the
telescope at a discrete object such as the top of a telephone
pole or a street sign that is at least a quarter-mile away.
Move the telescope so the target object appears in the very
center of the field of view when you look into the eyepiece.
Now look through the finder scope. Is the object centered
in the finder scope’s field of view, i.e., on the crosshairs?
If not, hopefully it will be visible somewhere in the field of
view, so only fine adjustment of the two black nylon align-
ment screws will be needed. Otherwise you’ll have to make
coarser adjustments to the alignment screws to redirect the
aim of the finder scope.
Use the two alignment screws to center the object on the
crosshairs of the finder scope. Then look again into the
Figure 2a. The 6x26 correct-image finder scope and bracket
Focus
lock-ring
Alignment thumbscrews
Tensioner
Figure 2b. Inserting the finder scope into the finder scope bracket

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main telescope’s eyepiece and see if it is still centered there
as well. If it isn’t, repeat the entire process, making sure not
to move the main telescope while adjusting the alignment of
the finder scope.
Finder scopes can come out of alignment during transport of
the telescope, so check the alignment before each observ-
ing session.
Focusing the Finder Scope
If, when looking through the finder scope, you notice the
images appear somewhat out of focus, you will need to
refocus the finder scope for your eyes. First loosen the lock
ring located behind the objective lens cell on the body of the
finder scope (see Figure 2a). Back the lock ring off by a few
turns, for now. Refocus the finder scope on a distant object
by threading the objective lens cell in or out of the finder
scope body. Precise focusing will be achieved by focusing the
finder scope on a bright star. Once the image appears sharp,
retighten the lock ring behind the objective lens cell. The
finder scope’s focus should not need to be adjusted again.
4. Using Your Telescope
Aiming the Telescope
To view an object in the main telescope, first loosen the azi-
muth lock knob. Point the telescope at the object you wish
to observe by “eyeballing” along the length of the telescope
tube. Then look through the (aligned) finder scope and
move the telescope tube until the object is generally cen-
tered on the finder’s crosshairs. Accurately center the object
on the finder’s crosshairs using the altitude and azimuth
slow-motion controls. The azimuth slow-motion control will
not engage until the azimuth lock knob is re-tightened. The
object should now be visible in the main telescope with the
lower-power (25mm) eyepiece. If necessary, use the slow-
motion controls to re-position the object within the field of
view of the main telescope’s eyepiece.
And remember to aim well clear of the Sun, unless the front
of the telescope is fitted with a professionally made solar fil-
ter and the finder scope is covered or removed altogether.
Note About the Slow-Motion-Controls
The slow-motion control cables can only move the telescope
a maximum of 30° in any direction. This is because the
worm gears the control cables attach to will reach the end
of their mechanical “travel.” If, when using the slow-motion
controls, you can no longer rotate one of the control cables
in a desired direction, you have reached the end of worm
gear travel, and the worm gear should be reset. This is done
by first rotating the control cable several turns in the opposite
direction from which it was originally being turned. Then,
manually move the telescope closer to the object you wish to
observe (remember to first loosen the azimuth lock knob, if
repositioning in azimuth). You should now be able to use the
slow-motion control again to fine-adjust your position.
Focusing the Telescope
Practice focusing the telescope in the daytime before using
it for the first time at night. Start by positioning the focuser
near the center of its adjustment range. Insert an eyepiece
into the diagonal and secure it with the thumbscrew. Point
the telescope at a distant object and get it in the field of view.
Now, slowly rotate one of the focusing knobs until the object
comes into sharp focus. Go a little bit beyond sharp focus
until the image just starts to blur again, then reverse the rota-
tion of the knob, just to make sure you hit the exact focus
point. The telescope can only focus on objects at least 100
feet or so away. It will not focus without the diagonal in place.
Do You Wear Eyeglasses?
If you wear eyeglasses, you may be able to keep them on
while you observe, if your eyepieces have enough “eye
relief” to allow you to see the whole field of view. You can try
this by looking through the eyepiece first with your glasses
on and then with them off, and see if the glasses restrict
the view to only a portion of the full field. If they do, you can
easily observe without your glasses by just refocusing the
telescope the needed amount.
Eyepiece Selection
Always start viewing with your lowest-power, widest-field
eyepiece. After you’ve located and looked at an object
with a low-power eyepiece, switch to a higher-power eye-
piece and see if the object looks better or worse. Keep in
mind that at higher power, an image will always be fainter
and less sharp (this is a fundamental law of optics). Many
observers use the lowest-power eyepiece practically all the
time! Naturally, higher magnifications are desirable for view-
ing some objects, but stay with low powers when searching
for an object and for extended viewing.
To calculate the power, or magnification, of an eyepiece
when used in a specific telescope, divide the focal length of
the telescope (an inherent specification of the telescope) by
the focal length of the eyepiece (the number, in millimeters,
stamped on the eyepiece):
Telescope F.L ÷ Eyepiece F.L. = Magnification
For example, if you’re using either of the Explorer tele-
scopes, which both have focal length of 910mm, and the
included 25mm eyepiece, the magnification would be:
910 ÷ 25 = 36x
We recommend having a selection of several eyepieces of
different focal lengths so you can choose the optimal mag-
nification for each object and for different observing condi-
tions.
Useful Limit of Magnification
Every telescope has a useful limit of power of about 2x per
millimeter of aperture (diameter of objective lens). Claims
of higher power by some telescope manufacturers are a
misleading advertising gimmick and should be dismissed.
The Explorer 90, with its 90mm aperture objective lens, is
capable of a maximum useful magnification of about 180x.
Likewise, the Explorer 80 has a maximum useful magnifica-
tion of approximately 160x. Any higher and the images will
virtually always appear very faint and fuzzy. As a general rule,
if the image you see is not crisp and steady, reduce the mag-
nification by switching to a longer focal length (lower power)

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eyepiece. A small but well-resolved image will show more
detail and be more rewarding than a dim, fuzzy, over-magni-
fied one.
For daytime viewing, it’s best to stick with low powers of 50x
or less. At higher powers, images will lose sharpness due to
sun-heated air; the “heat waves” from the ground will make
objects blurry and prevent obtaining a crisp focus.
Camera Attachment
With an optional camera adapter, the Explorers become a
910mm f/10 telephoto lens for a single-lens reflex camera.
For long-distance terrestrial or astronomical photography,
you need only a T-ring for your particular camera model.
The T-ring attaches to your particular camera model and
threads onto the Explorer’s focuser drawtube, coupling the
camera body to the telescope.
Use the camera’s viewfinder to frame the picture. Use the
telescope’s focuser to focus the image. Tighten the focus
lock thumbscrew (the large thumbscrew located on top of the
focuser) to make sure the camera does not slip out of focus.
You may want to consider using a remote shutter release
instead of the shutter release on the camera. Touching the
camera can vibrate the system and blur the resulting photo-
graphic image.
5. Astronomical Viewing
The Explorers can show much more than what is visible on
Earth during the day. Once the Sun sets, there are literally
thousands of objects in the night sky that can be inspected
more closely. For astronomical usage, we recommend a 90°
star diagonal instead of the 45° correct-image diagonal that
comes with the telescope. The correct-image diagonal is
designed for daytime use, and will cause some degradation
of image quality when used for astronomy. Also, the viewing
angle provided by a 90° star diagonal is more comfortable
for looking up. When using a star diagonal, the image in the
eyepiece will appear backwards (inverted left-to-right).
Choosing an Observing Site
When selecting a location for observing, get as far away
as possible from direct artificial light such as streetlights,
porch lights, and automobile headlights. The glare from
these lights will greatly impair your dark-adapted night
vision. Set up on a grass or dirt surface, not asphalt, because
asphalt radiates more heat. Heat disturbs the surrounding
air and degrades the images seen through the telescope.
Avoid viewing over rooftops and chimneys, as they often
have warm air currents rising from them. Similarly, avoid
observing from indoors through an open (or closed) window,
because the temperature difference between the indoor and
outdoor air will cause image blurring and distortion.
It’s best, although perhaps less convenient, to escape the
light-polluted city sky in favor of darker country skies. You’ll
be amazed at how many more stars and deep-sky objects
are visible in a dark sky!
Cooling the Telescope
All optical instruments need time to reach “thermal equilib-
rium.” The bigger the instrument and the larger the tempera-
ture change, the more time is needed. Allow at least a half-
hour for your telescope to cool to the temperature outdoors.
In very cold climates (below freezing), it is essential to store
the telescope as cold as possible. If it has to adjust to more
than a 40° temperature change, allow at least one hour.
Let Your Eyes Dark-Adapt
Don’t expect to go from a lighted house into the darkness of
the outdoors at night and immediately see faint nebulas, gal-
axies, and star clusters—or even very many stars, for that
matter. Your eyes take about 30 minutes to reach perhaps
80% of their full dark-adapted sensitivity. Many observers
notice improvements after several hours of total darkness.
As your eyes become dark-adapted, more stars will glimmer
into view and you’ll be able to see fainter details in objects
you view in your telescope. So give yourself at least a little
while to get used to the dark before you begin observing.
To see what you’re doing in the darkness, use a red-filtered
flashlight rather than a white light. Red light does not spoil
your eyes’ dark adaptation like white light does. Use a
flashlight with a red LED light, or you can cover the front
of a regular incandescent flashlight with red cellophane or
paper. Beware, too, that nearby porch lights, streetlights,
and car headlights will ruin your night vision.
“Seeing” and Transparency
Atmospheric conditions vary significantly from night to night.
“Seeing” refers to the steadiness of the Earth’s atmosphere
at a given time. In conditions of poor seeing, atmospheric
turbulence causes objects viewed through the telescope to
“boil.” If, when you look up at the sky with just your eyes,
the stars are twinkling noticeably, the seeing is bad and you
will be limited to viewing with low powers. Planetary observ-
ing may also be poor.
In conditions of good seeing, star twinkling is minimal and
images appear steady in the eyepiece. Seeing is best over-
head, worst at the horizon. Also, seeing generally gets bet-
ter after midnight, when much of the heat absorbed by the
Earth during the day has radiated off into space.
Especially important for observing faint objects is good
“transparency”—air free of moisture, smoke, and dust. All
tend to scatter light, which reduces an object’s brightness.
Transparency is judged by the magnitude of the faintest
stars you can see with the unaided eye (6th magnitude or
fainter is desirable).
Tracking Celestial Objects
Celestial objects appear to move slowly across the sky
because of the rotation of the Earth on its polar axis. When
you observe an object through the telescope, you’ll see it drift
gradually across the field of view. To keep the object cen-
tered, use the altitude and azimuth slow-motion controls as
needed. Objects will appear to move faster at higher magnifi-
cations because the field of view is narrower.

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How to Find Interesting Celestial Objects
To locate celestial objects with your telescope, you first
need to become reasonably familiar with the night sky.
Unless you know how to recognize the constellation Orion,
for instance, you won’t have much luck locating the Orion
Nebula. A simple planisphere, or star wheel, can be a valu-
able tool for learning the constellations and seeing which
ones are visible in the sky on a given night.
A good star chart or atlas can come in very handy for
helping find objects among the dizzying multitude of stars
overhead. Except for the Moon and the brighter planets,
it’s pretty time consuming and frustrating to hunt for objects
randomly, without knowing where to look. You should have
specific targets in mind before you begin looking through
the eyepiece.
Start with a basic star atlas, one that shows stars no fainter
than 5th or 6th magnitude. In addition to stars, the atlas
will show the positions of a number of interesting deep-sky
objects, with different symbols representing the different
types of objects, such as galaxies, open star clusters, glob-
ular clusters, diffuse nebulas, and planetary nebulas. So,
for example, your atlas might show that there is a globular
cluster sitting just above the lid of the “Teapot” pattern of
stars in Sagittarius. You then know to point your telescope
in that direction to locate the cluster, which happens to be
6.9-magnitude Messier 28 (M28).
You can see a great number and variety of astronomical
objects with your Explorer telescope, including:
The Moon
With its rocky, cratered surface, the Moon is one of the easi-
est and most interesting targets to view with your telescope.
The best time to observe our one and only natural satellite
is during a partial phase, that is, when the Moon is not full.
During partial phases, shadows on the surface reveal more
detail, especially right along the border between the dark and
light portions of the disk (called the “terminator”). A full Moon
is too bright and devoid of surface shadows to yield a pleas-
ing view. Use a Moon filter to dim the Moon for a better view.
The filter simply threads onto the bottom of the eyepiece.
The Planets
The planets don’t stay put like the stars, so to find them
you should refer to Sky Calendar at our website (www.
OrionTelescopes.com), or to charts published monthly in
Astronomy, Sky &Telescope, or other astronomy maga-
zines. Venus, Mars, Jupiter, and Saturn are the brightest
objects in the sky after the Sun and the Moon. Your Explorer
is capable of showing you these planets in some detail.
Other planets may be visible but will likely appear starlike.
Because planets are quite small in apparent size, optional
higher-power eyepieces are recommended and often need-
ed for detailed observations.
JUPITER The largest planet, Jupiter, is a great subject to
observe. You can see the disk of the giant planet and watch
the ever-changing positions of its four largest moons, Io,
Callisto, Europa, and Ganymede. If atmospheric conditions
are good, you may be able to resolve thin cloud bands on
the planet’s disk.
SATURN The ringed planet is a breathtaking sight when it is
well positioned. The tilt angle of the rings varies over a peri-
od of many years; sometimes they are seen edge-on, while
at other times they are broadside and look like giant “ears”
on each side of Saturn’s disk. A steady atmosphere (good
seeing) is necessary for a good view. You may see a tiny,
bright “star” close by; that’s Saturn’s brightest moon, Titan.
VENUS At its brightest, Venus is the most luminous object
in the sky, excluding the Sun and the Moon. It is so bright
that sometimes it is visible to the naked eye during full day-
light! Ironically, Venus appears as a thin crescent, not a full
disk, when at its peak brightness. Because it is so close to
the Sun, it never wanders too far from the morning or eve-
ning horizon. No surface markings can be seen on Venus,
which is always shrouded in dense clouds.
MARS If atmospheric conditions are good, you may be able
to see some subtle surface detail on the Red Planet, possi-
bly even the polar ice cap. Mars makes a close approach to
Earth every two years; during those approaches its disk is
larger and thus more favorable for viewing.
Stars
Stars will appear like twinkling points of light in the tele-
scope. Even powerful telescopes cannot magnify stars
to appear as more than points of light. You can, however,
enjoy the different colors of the stars and locate many pretty
double and multiple stars. The famous “Double-Double” in
the constellation Lyra and the gorgeous two-color double
star Albireo in Cygnus are favorites. Defocusing the image
of a star slightly can help bring out its color.
Deep-Sky Objects
Under dark skies, you can observe a wealth of fascinating
deep-sky objects, including gaseous nebulas, open and
globular star clusters, and some of the brighter galaxies.
Most deep-sky objects are very faint, so it is important you
find an observing site well away from light pollution. Take
plenty of time to let your eyes adapt to the darkness. Don’t
expect these subjects to appear like the photographs you
see in books and magazines; most will look like dim gray
smudges because our eyes are not sensitive enough to see
color in such faint objects. But as you become more experi-
enced and your observing skills get sharper, you will be able
to ferret out more and more subtle details.
Remember that the higher the magnification you use, the
dimmer the image will appear. So stick with low powers when
observing faint deep-sky objects.
6. Care and Maintenance
If you give your telescope reasonable care, it will last a
lifetime. Store it in a clean, dry, dust-free place, safe from
rapid changes in temperature and humidity. Do not store the
telescope outdoors, although storage in a garage or shed
is OK. Small components like eyepieces and other acces-
sories should be kept in a protective box or storage case.

Orion Telescopes & Binoculars
Post Office Box 1815, Santa Cruz, CA 95061
Customer Support Help Line [phone] • Day or Evening
Keep the objective lens cap on the front of the telescope
when it is not in use.
Your Explorer telescope requires very little mechanical main-
tenance. The optical tube is aluminum and has a smooth
painted finish that is fairly scratch-resistant. If a scratch does
appear on the tube, it will not harm the telescope. If you wish,
you may apply some auto touch-up paint to the scratch.
Smudges on the tube can be wiped off with a soft cloth and a
household cleaner.
Cleaning the Optics
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 the eye-
pieces and finder scope. 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 tis-
sue, 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. For larger lenses, clean only a small area
at a time, using a fresh lens tissue on each area. Never
reuse tissues.
7. Specifications
#9994 Explorer 80mm Altazimuth Refractor
Optical tube: Seamless aluminum
Objective lens diameter: 80mm (3.1")
Objective lens: Achromatic doublet, air-spaced
Objective lens coating: Fully-coated with multi-coatings
Focal length: 910mm
Focal ratio: f/11.4
Eyepieces: 25mm and 10mm Explorer IIs, fully coated,
1.25" barrel diameter, threaded for filters
Magnification: 36x (with 25mm) and 91x (with 10mm)
Focuser: Rack-and-pinion, metal, accepts 1.25" diagonal
and camera T-ring
Diagonal: 45° correct-image, 1.25" barrel diameter
Finder scope: 6x magnification, 26mm effective aperture,
achromatic, crosshairs, provides image orientation the
same as the naked eye
Mount: AZ-3, altazimuth
Tripod: Aluminum, adjustable height
Total instrument weight: 15 lbs.
#9029 Explorer 90mm Altazimuth Refractor
Optical tube: Seamless aluminum
Objective lens diameter: 90mm (3.5")
Objective lens: Achromatic doublet, air-spaced
Objective lens coating: Fully coated with multi-coatings
Focal length: 910mm
Focal ratio: f/10.1
Eyepieces: 25mm and 10mm Sirius Plössls, fully coated
with multi-coatings, 1.25"-barrel diameter, threaded for
filters
Magnification: 36x (with 25mm), 91x (with 10mm)
Focuser: Rack-and-pinion, metal, accepts 1.25" diagonal
and camera T-ring
Diagonal: 45° correct-image, 1.25" barrel diameter
Finder scope: 6x magnification, 26mm effective aperture,
achromatic, crosshairs, provides image orientation the
same as the naked eye
Mount: AZ-3, altazimuth
Tripod: Aluminum, adjustable height
Total instrument weight: 16 lbs.
One-Year Limited Warranty
This Orion Explorer Altazimuth 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, P. O. Box
1815, Santa Cruz, CA 95061; [phone].