Celestron C5+ User manual

THE CELESTRON C5
S P O T T I N G S C O P E
INSTRUCTION MANUAL

ii • Table of Contents
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! INTRODUCTION ................................................................................................................................................. 3
How to Use This Manual ................................................................................................................................ 3
A Word of Caution .......................................................................................................................................... 3
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!ASSEMBLING YOUR C5 SPOTTING SCOPE ................................................................................................. 4
Removing the Lens Cap ................................................................................................................................. 4
Attaching the Visual Accessories ................................................................................................................... 4
The Visual Back ...................................................................................................................................... 4
The Erect Image Diagonal ...................................................................................................................... 4
The Eyepiece ........................................................................................................................................... 5
Installing the Finderscope .............................................................................................................................. 6
Attaching the Finder Bracket to the Spotting Scope ..............................................................................6
Attaching the Finder to the Bracket ........................................................................................................ 7
Attaching the C5 to a Photographic Tripod ............................................................................................ 7
Technical Specifications ................................................................................................................................ 8
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!GETTING STARTED ........................................................................................................................................... 9
Focusing .......................................................................................................................................................... 9
Aligning the Finderscope ............................................................................................................................. 10
Your First Look ............................................................................................................................................. 11
Calculating Magnification ........................................................................................................................... 12
Determining Field of View ........................................................................................................................... 12
General Observing Hints ............................................................................................................................... 13
General Photography Hints ........................................................................................................................... 13
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!CARE AND MAINTENANCE ............................................................................................................................ 14
Care and Cleaning of the Optics ................................................................................................................... 14
Collimation ................................................................................................................................................... 14
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!OPTIONAL ACCESSORIES .............................................................................................................................. 16

Assembling Your Celestron C5 Spotting Scope •3
A spotting scope is nothing more than a telescope that is designed to look around the
Earth. Unlike astronomical telescopes, which produce inverted or reverted images,
spotting scopes produce correctly oriented images. Celestron offers several different
models, each of which uses the highest quality optics to produce the best possible
images. All models have rugged, durable housings to give you a lifetime of pleasure with
a minimal amount of maintenance.
This manual explains the proper use of your Celestron C5 spotting scope —from initial
set up to on-going use. This manual is broken down into several sections. The first covers
attaching your spotting scope to a stable platform, like a photographic tripod, so that
the standard accessories can be attached. The second section is on using your spotting
scope. Topics include how to attach the standard accessories, how to locate objects, etc.
The last four sections deal with general information. Topics include visual and
photographic observing hints, astronomical uses for your spotting scope, and mainte-
nance information. Before you attempt to use your spotting scope, read this manual
carefully.
Your Celestron spotting scope is designed to give you hours of fun and rewarding
observations.
There are, however, a few things to consider before using your spotting scope that will
ensure your safety and protect your equipment.
· Never look directly at the Sun with the naked eye or with your spotting scope. Permanent
and irreversible eye damage may result.
· Never use your spotting scope to project an image of the Sun onto any surface. Internal
heat build-up can damage your spotting scope and/or any accessories attached to it.
· Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside your
spotting scope can cause these devices to crack or break, allowing unfiltered sunlight
to pass through to the eye.
· Never leave your spotting scope unsupervised, either when children are present or adults
who may not be familiar with the correct operating procedures of your spotting scope.
· Never point your spotting scope at the Sun unless you have the proper solar filter. We
recommend Celestron solar filters only. Don't take chances -- use Celestron filters for
safety and performance! When using your spotting scope with the proper solar filter,
ALWAYS cover the finderscope. Although small in aperture, this instrument has enough
light gathering power to possibly cause permanent and irreversible eye damage. In
addition, the image projected by the finder is hot enough to burn skin and clothing.
Introduction
How to use this Manual
AWord of Caution!

4 •Assembling Your Celestron C5 Spotting Scope
This section covers the correct set up and operating procedures for your Celestron C5
spotting scope and includes information on visual and photographic observations. The
C5 spotting scope uses a combination of mirrors and lenses to produce an image. Such
an optical system is known as a compound lens. This particular design, known as a
Schmidt-Cassegrain, is one of the most compact and rugged optical systems on the
market today. The C5 (#11029) comes standard with the following accessories:
·26mm Plossl Eyepiece 1.25” (48x)
·8x20 Erect Image Finderscope
·45° Erect Image Diagonal - 1.25”
·Photo Tripod Adapter block
·Lens Cap
The Celestron C5 lens cap is made of spun aluminum with a felt-lined inner diam-
eter. The lens cap slides over the outer diameter of the C5’s front cell for a snug fit.
To remove the lens cap, simply hold onto the outer edge of the lens cap and pull
away from the front cell.
C5 Spotting Scope
Removing the Lens Cap
There are several accessories that come standard with all the Celestron C5's. The
installation and use of each of these is described in this section.
The Visual Back
The visual back allows you to attach all visual accessories to the spotting scope (See
Figure 1-1).
To attach the visual back:
1. Remove the plastic cover on the rear cell.
2. Place the knurled slip ring on the visual back over the threads on the rear
cell.
3. Hold the visual back with the thumbscrew in a convenient position and
rotate the knurled slip ring clockwise until tight.
Once this is done, you are ready to attach other accessories, such as eye-
pieces, diagonal prisms, etc.
If you want to remove the visual back, rotate the slip ring counterclockwise until
it is free of the rear cell.
The Erect Image Diagonal
The diagonal is a prism that diverts the light at a right angle from the light path of
the spotting scope. The C5 spotting scope comes with an erect image diagonal that
is designed for terrestrial viewing. To attach the diagonal:
1. Turn the thumbscrew on the visual back until its tip no longer extends into (i.e.,
obstructs) the inner diameter of the visual back.
Attaching the Visual
Accessories
ASSEMBLING YOUR C5 S P O T T I NG SCOPE

Assembling Your Celestron C5 Spotting Scope •5
The Eyepiece
The eyepiece, or ocular, is the optical element that magnifies the image focused by
the spotting scope. The eyepiece fits into either the visual back directly or the erect
image diagonal. To install an ocular:
1. Loosen the thumbscrew on the star diagonal (or erect image diagonal) so it
does not obstruct the inner diameter of the eyepiece end of the diagonal.
2. Slide the chrome portion of the eyepiece into the star diagonal (or erect
image diagonal).
3. Tighten the thumbscrew to hold the eyepiece in place.
To remove the eyepiece, loosen the thumbscrew on the star diagonal and slide
the eyepiece out.
Eyepieces are commonly referred to by focal length and barrel diameter. The
focal length of each eyepiece is printed on the eyepiece barrel. The longer the
focal length (i.e., the larger the number) the lower the eyepiece power or
magnification; and the shorter the focal length (i.e., the smaller the number) the
higher the magnification. Generally, you will use low-to-moderate power when
viewing. For more information on how to determine power, see the section on
“Calculating Magnification.”
Barrel diameter is the diameter of the barrel that slides into the diagonal or visual
back. The C5 spotting scope use eyepieces with a standard 1-1/4" barrel diameter.
2. Slide the chrome portion of the diagonal into the visual back.
3. Tighten the thumbscrew on the visual back to hold the diagonal in place.
If you wish to change the orientation of the diagonal, loosen the thumbscrew on the
visual back until the diagonal rotates freely. Rotate the diagonal to the desired
position and tighten the thumbscrew.
Figure 1-1

6 •Assembling Your Celestron C5 Spotting Scope
Figure 1-2
Attaching the eyepiece directly to the C5 rear cell. Doing this will invert (i.e., upside down
and backwards) the image through the spotting scope.
Eyepiece
Rear Cell
Visual Back
Thumbscrew
The C5 spotting scope come standard with a terrestrial (erect image) 8x20 finder.
The purpose of the finder is to locate objects that might otherwise be overlooked in
the narrow, higher power field of view of the spotting scope.
Begin by removing the finder and mounting hardware from the plastic shipping
wrapper. Included with the finder are five Allen head screws: two hold the
bracket to the spotting scope and three hold the finder in place inside the bracket.
The three that hold the finder in place are easy to identify since they are nylon.
In addition, there is also a rubber O-ring used to keep the finder secure in the
bracket. Mounting the finder and bracket is a two-step process; first mounting
the bracket to the spotting scope, then mounting the finder in the bracket.
Attaching the Finder Bracket to the Spotting Scope
1. Locate the two holes in the rear cell of the spotting scope just right of center
(when looking from the back of the tube).
2. Remove the tape covering the two holes. The tape prevents dust and
moisture from entering the optical tube before the finder is installed.
3. Place the finder bracket over the holes. The bracket should be oriented so
that the ring with the holes for the adjustment screws is closer to the rear
cell (eyepiece end) of the spotting scope (see figure 1-3).
4. Thread the screws in by hand and then tighten with one of the Allen
wrenches provided.
Installing the Finderscope

Assembling Your Celestron C5 Spotting Scope •7
Attaching the Finder to the Bracket
With the bracket firmly attached to the spotting scope, you are ready to attach the
finder to the bracket.
1. Thread the three screws into the finder bracket. Tighten the screws until the
ends are flush with the inner diameter of the bracket ring. Do not thread them
in completely or they will interfere with the placement of the finder.
2. Slide the rubber O-ring onto the back (eyepiece end) of the finder — it may
need to be stretched a little.
3. Position the O-ring on the main body of the finder so that it is toward the front
(i.e., objective) end of the finder.
4. Slide the finder, objective end first, into the front ring of the bracket. Push it
back until the O-ring is snug inside the front ring of the bracket.
5. Hand tighten the three set screws until snug.
To align the finder, please see the section on “Aligning the Finder.”
The C5 spotting scope will attach to any photographic tripod with a 1/4x20
threaded screw. The C5 attaches to the tripod via a photo tripod adapter block that
has three 1/4x20 holes. To attach the C5 to a photographic tripod:
1. Place any of the 1/4x20 holes in the photo tripod adapter block over the 1/4x20
screw on your photographic tripod.
2. Tighten the 1/4x20 screw to hold the C5 firmly in place.
If the telescope/spotting scope is not properly balanced, try using one of the other
holes in the photo tripod adapter block. Once mounted on the photographic tripod,
you are ready to use your C5 spotting scope.
Attaching the C5 to a
Photographic Tripod
Figure 1-3

8 •Assembling Your Celestron C5 Spotting Scope
Figure 1-4
The C5 spotting scope attaches to a photographic tripod via the photo adapter on the
bottom of the tube.
Following is pertinent technical information for the Celestron C5 spotting scope
that you may find useful.
• Hand figured diffraction limited optical system
• 5" aperture (125mm) f/10
• Focal length — 1250mm (50")
• Schmidt-Cassegrain optical system
Resolution 0.9 arc sec.
• Tube — 11" long
• Weight (with mount) — 6 pounds
• 8x20 finder
• Highest useful magnification — 300x
• Lowest useful magnification — 23x
• Limiting magnitude (visual) — 13
• Near Focus — Approximately 20'
• Angular field of view with standard eyepiece: 1.04°
• Angular field of view using optional Reducer/Corrector lens: 1.7°
• Spun aluminum lens cover
• Starbright coatings standard — AR coating on corrector yield greater light
transmission while HR coatings on primary and secondary mirrors provide
greater reflectivity.
Technical Specifications

Getting Started •9
GETTING STARTED
Once your spotting scope is fully assembled, you are ready for your first look. This
section deals with the basics of your spotting scopes operation.
The Celestron C5 spotting scope focusing mechanism controls the position of the
primary mirror which is mounted on a sleeve that slides back and forth on the
primary baffle tube (see figure 2-2). The focusing knob, which moves the primary
mirror, is on the rear cell of the C5 to the right of the diagonal and eyepiece. Turn
the focusing knob until the image is sharp. If the knob will not turn, the primary
mirror has reached the end of its travel on the focusing mechanism. Turn the knob
in the opposite direction until the image is sharp. Once an image is in focus, turn
the knob clockwise to focus on a closer object and counterclockwise for a more
distant object (see figure 2-1). A single turn of the focusing knob moves the primary
mirror only slightly. Therefore, it will take many turns (about 40) to go from close
focus (approximately 20 feet) to infinity. For astronomical viewing, out-of-focus
star images are very diffuse making them difficult, if not impossible, to see. If you
turn the focus knob too quickly, you can go right through focus without seeing the
image. For best results, your first astronomical target should be a bright object (like
the Moon) so that the image is visible even when out of focus.
Focusing
Figure 2-1
The decal on the end of the
focus knob shows the correct
rotational direction for
focusing the C5.
Figure 2 -2
This diagram shows the focusing mechanism of the C5 spotting scope.

10 •Getting Started
The Celestron C5 comes with a 8x20mm finder that helps in aiming at distant
objects that are hard to find in the narrow field of the spotting scope. The first
number used to describe the finder is the power while the second number is the
diameter of the objective lens in millimeters. This means the 8x20 finder is 8 power
and has a 20mm objective lens. Incidentally, power is always compared to the
unaided human eye. So a 8 power finder magnifies images eight times more than the
human eye.
To make the alignment process a little easier, you should perform this task in
the daytime when it is easier to locate objects in the spotting scope without the
finder. To align the finder:
1. Choose a conspicuous object that is in excess of one mile away. This will
eliminate any possible parallax effect.
2. Point your spotting scope at the object you selected and center it in the main
optics of the spotting scope.
3. Check the finder to see where your alignment target is located in the field
of view.
4. Adjust the screws on the finder bracket, tightening one while loosening
another, until the cross hairs are centered on the target.
5. Tighten each set screw a quarter of a turn to ensure that they will not
come loose easily.
Aligning the Finder

Getting Started •11
With the spotting scope fully assembled and all the accessories attached, you are
ready for your first look. Observing can be broken down into two distinct catego-
ries; terrestrial and celestial. Terrestrial observing is generally done in the daytime
as subjects are usually wildlife, birds, or scenic views. Celestial observing is
generally done at night when stars and planets are visible. Regardless of your
preference, your first look should be done in the daytime so you can see the various
parts of your C5 and better familiarize yourself with its operation.
Before you can use your C5 to look at anything it must first be attached to a stable
mount. For spotting scope owners, this would be a heavy-duty photographic tripod.
WARNING! NEVER POINT YOUR SPOTTING SCOPE AT THE SUN UNLESS YOU
HAVE THE PROPER CELESTRON SOLAR FILTER. PERMANENT
AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS
DAMAGE TO YOUR SPOTTING SCOPE. ALSO, NEVER LEAVE YOUR
SPOTTING SCOPE UNATTENDED DURING A DAYTIME OBSERVING
SESSION, ESPECIALLY WHEN CHILDREN ARE PRESENT.
To use your C5 spotting scope visually:
1. Find a distant object that is fairly bright.
2. Insert a low power eyepiece (one with a long focal length —25 to 30mm)
into the spotting scope.
3. Adjust the tripod until the C5 is pointed in the direction of the object you
selected.
4. Locate the object in your finder.
5. Move the C5 until the object is centered in the finder.
6. Look through the main optics and the object will be there (if you aligned
the finder first).
Once you have found the object, you will most likely need to focus. If the
object is moving, leave the adjustment clamps loose so that you can pan
easily. Try using different optional eyepieces to see how the field changes with
various magnifications.
Your First Look

12 •Getting Started
You can change the power of your Celestron C5 spotting scope just by changing the
eyepiece (ocular). To determine the magnification of your Celestron C5, simply
divide the focal length of the spotting scope by the focal length of the eyepiece
used. In equation format, the formula looks like this:
Focal Length of Spotting Scope (mm)
Magnification = ————————————————
Focal Length of Eyepiece (mm)
Let’s say, for example, that you are using a 26mm eyepiece. To determine the
magnification, you simply divide the focal length of your C5 (1250mm) by the focal
length of the eyepiece (26mm). Dividing 1250 by 26 yields a magnification of 48
power.
Although the power is variable, each instrument —under average skies —has
a limit to the highest useful magnification. The general rule is that 60 power
can be used for every inch of aperture. For example, the C5 is 5" in diameter.
Multiplying 5 by 60 gives a maximum useful magnification of 300 power.
Although this is the maximum useful magnification, most observing is done
between 20 to 35 power for every inch of aperture which is 100 to 175 times for
the C5.
Determining the field of view is important if you want to get an idea of the angular
size of the object you are observing. To calculate the actual field of view, divide the
apparent field of the eyepiece (supplied by the eyepiece manufacturer) by the
magnification. In equation format, the formula looks like this:
Apparent Field of Eyepiece (in degrees)
True Field =
Magnification
As you can see, before determining the field of view, you must first calculate
the magnification. Using the example in the previous section, we can deter-
mine the field of view using the same 26mm eyepiece. The 26mm Plossl eyepiece
has an apparent field of view of 50°. Divide the 50°apparent field by the magnifica-
tion, which is 48 power. This yields an actual field of 1.04°, or a little over one
degree.
To convert degrees to feet at 1,000 yards, which is more useful for terrestrial
observing, simply multiply by 52.5. Continuing with our example, multiplying
the angular field 1.2°by 52.5 produces a linear field width of 55 feet at a distance of
one thousand yards.
The apparent field of each eyepiece that Celestron manufactures is found in the
Celestron Accessory Catalog (#93685).
Calculating
Magnification
Determining Field of
View

Getting Started •13
When working with any optical instrument, there are a few things to remember to
ensure you get the best possible image.
•Never look through window glass. Glass found in household windows is
optically imperfect and, as a result, may vary in thickness from one part of a
window to the next. This inconsistency can and will affect the ability to focus
your spotting scope. In most cases you will not be able to achieve a truly sharp
image. In some cases, you may actually see a double image.
•Never look across or over objects that are producing heat waves. This
includes asphalt parking lots on hot summer days or building rooftops.
•Hazy skies, fog, and mist can also make it difficult to focus when viewing
terrestrially. The amount of detail seen under these conditions is greatly
reduced. Also, when photographing under these conditions, the processed
film may come out a little grainier than normal with lower contrast.
•When using your C5 as a telephoto lens, the split screen or microprism
focuser of the 35mm SLR camera may “black out.”This is common with all
long focal length lenses. If this happens, use the ground glass portion of
your focusing screen. To achieve a very sharp focus, consider using a
focusing magnifier. (These are readily available from your local camera
store.)
•If you wear corrective lenses (specifically glasses), you may want to remove
them when observing with an eyepiece attached to your C5. When using a
camera, however, you should always wear corrective lenses to ensure the
sharpest possible focus. If you have astigmatism, corrective lenses should
be worn at all times.
Your Celestron C5 can be used for both terrestrial and astronomical photography.
Your C5 has a fixed aperture and, as a result, a fixed f/ratio. To properly expose
your subjects photographically, you need to set your shutter speed accordingly.
Most 35mm single lens reflex (SLR) cameras offer through-the-lens metering that
lets you know if your picture is under or overexposed. This is important for terres-
trial photography where exposure times are measured in fractions of a second.
To reduce vibration when tripping the shutter, use a cable release. Releasing the
shutter manually can cause vibration, something that produces blurred photos. A
cable release allows you to keep your hands clear of the camera and spotting scope,
thus reducing the possibility of shaking the spotting scope. Mechanical shutter
releases can be used, though air-type releases are best.
General Photography
Hints
General Observing Hints

14 •Spotting Scope Maintenance
C A R E & MAINTENANCE
While the C5 spotting scope requires little maintenance, there are a few things to
remember that will ensure your spotting scope performs at its best.
Occasionally, dust and/or moisture may build up on the corrector plate of your
C5. Special care should be taken when cleaning any instrument so as not to
damage the optics.
If dust has built up on the corrector plate, remove it with a brush (made of
camel’s hair) or a can of pressurized air. Spray at an angle to the lens for
approximately two to four seconds. Then, use an optical cleaning solution and
white tissue paper to remove any remaining debris. Apply the solution to the
tissue and then apply the tissue paper to the lens. Low pressure strokes
should go from the center of the corrector to the outer portion. Do NOT rub in
circles!
You can use a commercially made lens cleaner or mix your own. A good
cleaning solution is isopropyl alcohol mixed with distilled water. The solution
should be 60% isopropyl alcohol and 40% distilled water. Or, liquid dish soap
diluted with water (a couple of drops per one quart of water) can be used.
Occasionally, you may experience dew build-up on the corrector plate of your
C5 during an observing session. If you want to continue observing, the dew
must be removed, either with a Celestron Lens Shade / Dew Cap or by pointing the
spotting scope at the ground until the dew has evaporated.
If moisture condenses on the inside of the corrector, place the spotting scope in a
dust-free environment and point it down. Remove the accessories from the rear
cell of the spotting scope to allow the moisture to evaporate from the optical tube.
To minimize the need to clean your spotting scope, replace all lens covers once you
have finished using it. Since the rear cell is NOT sealed, the cover should be placed
over the opening when not in use. This will prevent contaminants from entering the
optical tube.
Internal adjustments and cleaning should be done only by the Celestron repair
department. If your C5 is in need of internal cleaning, please call the factory
for a return authorization number.
The optical performance of your Celestron C5 spotting scope is directly related to
its collimation, that is the alignment of its optical system. Your C5 was collimated
at the factory after it was completely assembled. However, if the spotting scope is
dropped or jarred severely during transport, it may have to be collimated. The only
optical element that can be adjusted by you is the tilt of the secondary mirror.
To check the collimation of your C5 you will need a light source. A bright star high
in the sky is ideal since there is a minimal amount of atmospheric distortion. If the
star moves too rapidly through the field of view of the spotting scope, use Polaris.
Its position relative to the celestial pole means that it moves very little thus elimi-
nating the need to track it.
Care and Cleaning
of the Optics
Collimation

Spotting Scope Maintenance •15
Before you begin the collimation process, be sure that your spotting scope is in
thermal equilibrium with the surroundings. Allow 45 minutes for the spotting scope
to reach equilibrium if you move it between large temperature extremes.
To verify collimation, view a star near the zenith. Use a medium to high power
ocular —12mm to 6mm focal length. It is important to center a star in the
center of the field to judge collimation. Slowly cross in and out of focus and
judge the symmetry of the star. If you see a systematic skewing of the star to
one side, then recollimation is needed.
To accomplish this, you need to adjust the secondary collimation screw(s) that
move the star across the field toward the direction of the skewed light (see
figure 3-1). Make only small corrections, approximately 1/6 to 1/8 of the field.
Recenter the star by moving the spotting scope before making further adjustments.
When using higher power, 6mm and above, collimation is best accomplished
with the spotting scope in focus. In this instance, you are observing the Airy disk
(see figure 3-2), not the shadow of the secondary housing. This (stellar) image
appears as a bright point of light with a diffraction ring around it. When the
point of light is perfectly centered within the diffraction ring, your spotting scope is
in collimation. Keep in mind that to use high power, the seeing conditions must be
very good.
Perfect collimation yields a star or planetary image very symmetrical just
inside and outside of focus. Also, perfect collimation delivers the optimal
optical performance specifications that your spotting scope is built to achieve.
If seeing (i.e., air steadiness) is turbulent, collimation is difficult to judge. Wait
until a better night if it is turbulent or aim to a steadier part of the sky. A
steadier part of the sky is judged by steady versus twinkling stars.
NOTE: THE ADJUSTMENT SCREWS ON THE SECONDARY MIRROR ARE
VERY SENSITIVE. USUALLY A TENTH OF A TURN WILL COM-
PLETELY CHANGE THE COLLIMATION OF THE SPOTTING SCOPE.
DO NOT FORCE THESE SCREWS IF THEY WILL NOT TURN. IF
TIGHTENING ONE SCREW IN THE DIRECTION YOU NEED TO GO IS
DIFFICULT, SIMPLY LOOSEN THE OTHER TWO SCREWS BY
EQUAL AMOUNTS TO BRING ABOUT THE SAME CHANGE. DO NOT
BE INTIMIDATED BY TOUCHING UP COLLIMATION AS NEEDED
TO ACHIEVE OPTIMAL HIGH-RESOLUTION VIEWS. IT IS WORTH
THE TROUBLE!!!!
Figure 3-1
Left: With an out-of-focus
star image at the center of
the field, the secondary
mirror shadow is off center
indicating the spotting scope is
out of collimation Right: The
out-of-focus star image
showing good collimation.
Figure 3-2
In focus images show the
C5 in collimation (left) and
out of collimation (right).

16 • Optional Accessories
OPTIONAL ACCESSORIES
The following is a partial list of optional accessories available for your Celestron
C5 spotting scope. You will find that additional accessories enhance your
viewing pleasure and expand the usefulness of your spotting scope.
Barlow Lens - A Barlow lens is a negative lens that increases the focal length
of a telescope. Used with any eyepiece, it doubles the magnification of that
eyepiece. Celestron offers two Barlow lens in the 1-1/4" size for the C5. The
2x Ultima Barlow (#93506) is a compact triplet design that is fully multicoated
for maximum light transmission and parfocal when used with the Ultima
eyepieces. Model #93507 is a compact achromatic Barlow lens that is under
three inches long and weighs only 4 oz. It works very well with all Celestron
eyepieces.
CD-ROM (93700) - Celestron and Software Bisque have joined together to
present this comprehensive CD-ROM called The Sky™Level 1 - from
Celestron. It features a 10,000 object database, 75 color images, horizontal
projection, custom sky chart printing, zoom capability and more! A fun, useful
and educational product. PC format.
Photo Tripod Slow Motion Controls (#93804-A) - If you have ever tried
pointing a spotting scope while mounted on a photographic tripod, you know
how tough it can be to center your subject. The Deluxe Photo Tripod Slow
Motion Control solves that problem. Fitting between the C5 and the photo-
graphic tripod, this accessory allows you to make fine pointing adjustments,
both vertically and horizontally. The Deluxe model (#93804-DX) has ultra
smooth controls and virtually no backlash.
Eyepieces - Like telescopes, eyepieces come in a variety of designs. Each
design has its own advantages and disadvantages. For the 1-1/4" barrel
diameter there are four different eyepiece designs available.
• Super Modified Achromatic (SMA) Eyepieces: 11/4 "
The SMA design is an improved version of the Kellner eyepiece. SMAs
are very good, economical, general purpose eyepieces that deliver a
wide apparent field, good color correction and an excellent image at the
center of the field of view. Celestron offers SMA eyepieces in the following
focal lengths: 6mm, 10mm, 12mm, 17mm and 25mm.
• Plössl - Plössl eyepieces have a 4-element lens designed for low-to-high
power observing. The Plössls offer razor sharp views across the entire
field, even at the edges! In the 1-1/4" barrel diameter, they are available in
the following focal lengths: 6.3mm, 7.5mm, 10mm, 12.5mm, 17mm,
20mm, 26mm, 32mm and 40mm.
• Ultima - Ultima is not really a design, but a trade name for our 5-element,
wide field eyepieces. In the 1-1/4" barrel diameter, they are available in
the following focal lengths: 5mm, 7.5mm, 12.5mm, 18mm, 30mm,
35mm, and 42mm. These eyepieces are all parfocal. The 35mm Ultima
gives the widest possible field of view with a 1-1/4" diagonal and is ideal
for the C5 with or without the Reducer/Corrector.

Optional Accessories •17
• Lanthanum Eyepieces (LV Series) - Lanthanum is a unique rare earth
glass used in one of the field lenses of this new eyepiece. The Lantha-
num glass reduces aberrations to a minimum. All are fully multicoated
and have an astounding 20mm of eye relief —perfect for eyeglass
wearers! In the 1-1/4" barrel diameter, they are available in the following
focal lengths: 2.5mm, 4mm, 5mm, 6mm, 9mm, 10mm, 12mm and
15mm. Celestron also offers the LV Zoom eyepiece (#3777) with a focal
length of 8mm to 24mm. It offers an apparent field of 40o at 24mm and
60o at 8mm. Eye relief ranges from 15mm to 19mm.
Night Vision Flashlight - (#93588) - Celestron’s premium model for as-
tronomy, using two red LEDs to preserve night vision better than red filters or
other devices. Brightness is adjustable. Operates on a single 9 volt battery
(included).
Moon Filter (94119-A) - Celestron’s Moon Filter is an economical eyepiece
filter for reducing the brightness of the moon and improving contrast, so
greater detail can be observed on the lunar surface. The clear aperture is
21mm and the transmission is about 18%.
Planisphere (93720) - A simple and inexpensive tool for all levels of observers,
from naked eye viewers to users of highly sophisticated telescopes. The
Celestron Planisphere makes it easy to locate stars for observing and is a
great planet finder as well. A map of the night sky, oriented by month and day,
rotates within a depiction of the 24 hours of the day, to display exactly which
stars and planets will be visible at any given time. Ingeniously simple to use,
yet quite effective. Made of durable materials and coated for added
protection. Celestron Planispheres come in three different models, to match
the latitude from which you’re observing:
For 20°to 40°of latitude 93720-30
For 30°to 50°of latitude 93720-40
For 40°to 60°of latitude 93720-50
Photographic Tripod (#93596) - Even at low power, your C5 Spotting Scope
produces too much power to hand hold. For the best results, use a stable
platform like the Celestron Photographic Tripod. This tripod has an oil fluid pan
head for smooth panning. The quick release head allows you to attach and
remove the C5 quick and easily. It is extremely lightweight and rigid.
Reducer/Corrector (#94175) - This lens reduces the focal length of the
telescope by 37%, making your spotting scope a 787.5mm f/6.3 instrument.
In addition, this unique lens also corrects inherent aberrations to produce crisp
images all the way across the field when used visually. When used photo-
graphically, there is some vignetting that produces a 26mm circular image on
the processed film.
Sky Map (#93722) - Celestron Sky Maps are the ideal teaching guide for
learning the night sky. You wouldn’t set off on a road trip without a road map,
and you don’t need to try to navigate the night sky without a map either. Even
if you already know your way around the major constellations, these maps can
help you locate all kinds of fascinating objects.

18 •Optional Accessories
Skylight Filter (#93621) - The Skylight filter is used on the Celestron C5
spotting scope as a dust seal. The filter threads onto the rear cell of your
telescope. All other accessories, both visual and photographic (with the
exception of Barlow lenses), thread onto the skylight filter. The light loss
caused by this filter is minimal.
Star Diagonal (94115-A) - A Star Diagonal lets you view objects that are at a
90°angle from the direction the telescope is pointing, thereby allowing comfort-
able viewing when pointed near the zenith (i.e. directly overhead). The resulting
image is right side up, but will be reversed from left to right.
T-Adapter (#93633-A) - T-Adapter (with additional T-Ring) allows you to attach
your 35mm SLR camera to the rear cell of your Celestron C5. This turns your
C5 into a 1250mm telephoto lens perfect for terrestrial photography and short
exposure lunar photography.
T-Ring - The T-Ring couples your 35mm SLR camera body to the T-Adapter,
radial guider, or tele-extender. This accessory is mandatory if you want to do
photography through the telescope. Each camera make (i.e., Minolta, Nikon,
Pentax, etc.) has its own unique mount and therefore, its own T-Ring.
Celestron has 8 different models for 35mm cameras.
Vibration Suppression Pads (#93503) - These pads rest between the ground
and tripod feet. They reduce the amplitude and vibration time of your telescope
when shaken by the wind or an accidental bump. This accessory is a must for
long exposure prime focus photography.
A full description of all Celestron accessories can be found in the
Celestron accessory catalog (#93685).

CELESTRON ONE YEAR WARRANTY
A. Celestron International (CI) warrants this spotting scope to be free from defects in materials and workmanship for one year. CI will repair
or replace such product or part thereof which, upon inspection by CI, is found to be defective in materials or workmanship. As a condition
to the obligation of CI to repair or replace such product, the product must be returned to CI together with proof-of-purchase satisfactory to
CI.
B. The Proper Return Authorization Number must be obtained from CI in advance of return. Call Celestron at [phone] to receive
the number to be displayed on the outside of your shipping container.
All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together
with a brief description of any claimed defects. Parts or product for which replacement is made shall become the property of CI.
The customer shall be responsible for all costs of transportation and insurance, both to and from the factory of CI,
and shall be required to prepay such costs.
CI shall use reasonable efforts to repair or replace any spotting scope covered by this warranty within thirty days of receipt. In the event
repair or replacement shall require more than thirty days, CI shall notify the customer accordingly. CI reserves the right to replace any product
which has been discontinued from its product line with a new product of comparable value and function.
This warranty shall be void and of no force of effect in the event a covered product has been modified in design
or function, or subjected to abuse, misuse, mishandling or unauthorized repair. Further, product malfunction or
deterioration due to normal wear is not covered by this warranty.
CI DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY OF FITNESS FOR A
PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN.
THE SOLE OBLIGATION OF CI UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED
PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. CI EXPRESSLY DISCLAIMS ANY LOST PROFITS,
GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY
WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY CI PRODUCT. ANY WARRANTIES WHICH ARE
IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF ONE YEAR FROM
THE DATE OF ORIGINAL RETAIL PURCHASE.
Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty
lasts, so the above limitations and exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
CI reserves the right to modify or discontinue, without prior notice to you, any model or style spotting scope.
If warranty problems arise, or if you need assistance in using your spotting scope contact:
Celestron International
Customer Service Department
2835 Columbia Street
Torrance, CA 90503
Tel. [phone]
Fax. [phone]
Monday-Friday 8AM-4PM PST
This warranty supersedes all other product warranties.
NOTE: This warranty is valid to U.S.A. and Canadian customers who have purchased this product from an
Authorized CI Dealer in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada is valid only to custom-
ers who purchased from a CI International Distributor or Authorized CI Dealer in the specific country and
please contactthem for any warranty service.

2835 Columbia Street
Torrance, CA 90503
Tel. [phone]
Fax [phone]
Copyright 1999 Celestron International
All rights reserved.
(Products or instructions may change
without notice or obligation.)
Item # 94173
11-99
Price $10.00