Celestron 52291 Manuel utilisateur

C5 Spotting Scope - #52291

Instruction Manual

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.

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.

Assembly

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 (#52219) comes

standard with the following accessories:

·25mm Plossl Eyepiece 1.25” (48x)

·6x30 Erect Image Finderscope

·45° Erect Image Diagonal - 1.25”

·Photo Tripod Adapter block

·Nylon Water Resistant Case

·Lens Cap

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.

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.

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.

Finderscope

The C5 spotting scope come standard with a terrestrial (erect image) 6x30 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.

Attaching the Finder to the Bracket

1. Unthread the three screws in the finder bracket. 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.

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, eyepiece

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.

Following is pertinent technical information for the Celestron C5 spotting scope

that you may find useful.

• 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

Finderscope

Nylon

Adjustment

Screw

Finder Bracket

Rear Cell

The emblem on the end of

the focus knob shows the

correct rotational direction

for focusing your telescope

• 6x30 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°

• Lens cover

• Starbright XLT coatings — XLT coating on corrector yield greater light

transmission and provides greater reflectivity on primary and secondary

mirrors

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. 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. 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.

The Celestron C5 comes with a 6x30mm 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 6x30 finder is 6

power and has a 30mm objective lens. Incidentally, power is always compared to

the unaided human eye. So an 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.

With the spotting scope fully assembled and all the accessories attached, you are

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.

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 determine the

field of view using the same 26mm eyepiece. The 25mm Plossl eyepiece has an

apparent field of view of 52°. Divide the 52° apparent field by the magnification,

which is 50 power. This yields an actual field of 1.04°.

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 1.04° by 52.5 produces a linear field width of 54.6 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).

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 terrestrial 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

& MAINTENANC

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

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