Celestron 80ED Manuel utilisateur

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INTRODUCTION

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.

How to Use this Manual

This manual explains the proper use of your Celestron 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 sections deal with general information. Topics include

visual and photographic observing hints, astronomical uses for your spotting scope, and maintenance

information. Before you attempt to use your spotting scope, read this manual carefully.

A Word of Caution!

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. 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.

GETTING STARTED

The high magnification of your spotting scope makes it very difficult to handhold and, as a result, it

must be attached to a stable platform. The 80ED has a tripod adapter, which is located on the bottom

of the spotting scope's tube ring. Remove your spotting scope from the box and attach it to a mount as

described below.

Photographic Tripod

For best results, attach your Celestron spotting scope to a heavy duty photo tripod with a quick

release platform. To attach your spotting scope to the tripod:

1. Place the tripod adapter located on the bottom of the tube ring clamp, over the 1/4x20 screw on

the photo tripod quick release platform. Keep in mind that the platform is not on the tripod at this

time. Tighten the screw (located on the under side of the platform) until tight. Just in front of the

1/4x20 screw is usually a small peg used to secure video cameras to the tripod. If you are not

using a video camera, this peg, which is spring-loaded, will push down into the tripod head.

2. Rotate the platform lock clockwise. Slide the front of the platform in first, then pivot the back in.

3. Push the platform lock counterclockwise until it touches the under side of the tripod head. This

will hold the platform in place.

Once mounted on the tripod, you are ready to attach the standard accessories.

Equatorial Mount

Your 80ED has a dovetail bracket on the bottom of the tube ring clamp that allows it to be used with

the Advanced GT CG-5 equatorial mount. Follow the directions in your mounts owner manual for

instruction on attaching the optical tube.

What next?

With your spotting scope firmly attached to a stable platform, you are ready to attach the standard

accessories and begin using your spotting scope.

Spotting Scope Setup

This section covers the correct set up and operating procedures for your Celestron 80mm ED spotting

scope and includes information on visual and photographic observations. The spotting scope uses a

refractor optical design with a two-element lens made of low dispersion optical glass. Unlike other

spotting scopes which have built-in correcting prisms, the 80ED uses a diagonal to produce a

correctly oriented image. This allows you to use your spotting scope like a conventional telephoto

when a camera is attached. The basic Celestron 80ED comes standard with the following accessories:

80ED Spotting Scope

25mm Plossl Eyepiece 1 1/4” (24x)

45° Erect Image Diagonal – 1 1/4”

6x30 Erect Image Finderscope

Lens Caps

¼ x 20 Dovetail Mounting Adapter

Take a few minutes to study the diagram below to help familiarize yourself with the various parts of

your spotting scope for set up and ongoing use.

Figure 1 – Wide View spotting scope shown on optional tripod

Removing the Lens Cover

To protect your spotting scope, the objective lens, focuser, and accessories are fitted with protective

covers. All are tension-fitted and easily removed by pulling off. The covers should be removed as

each piece is installed. Once removed, place the covers in the box to ensure they won’t get lost.

Attaching the Standard Accessories

With your spotting scope attached to a sturdy mount, as described earlier in this manual, you are

ready to attach the standard accessories. To do this:

1. Remove the protective covers from the focuser of the spotting scope, the 45ºErect Image

Diagonal, and the eyepiece.

2. Loosen the thumbscrew on the focuser of the spotting scope so that the opening (i.e., inner

diameter) is unobstructed.

3. Slide the chrome barrel of the 45º

Erect Image Diagonal into the focuser

barrel.

4. Tighten the thumbscrew on the focuser

to hold it in place.

5. Loosen the thumbscrew on the

eyepiece holder of the 45ºErect Image

Diagonal. Make sure that it does not

block the inner diameter of the

eyepiece holder.

Figure 2

Objective Lens

Quick-release

Finderscope

Bracket

45º Erect Image

Diagonal

Focuser Knob

Tube Ring

Clamp Finderscope

Eyepiece

Dovetail / Photo

Tripod Mount

Focuser

6. Insert the chrome barrel of the eyepiece into the 45ºErect Image Diagonal.

7. Tighten the thumbscrew on the 45° Erect Image Diagonal to hold the eyepiece in place.

Attaching The Finderscope

Your spotting scope comes with a 6x30mm erect image finderscope to help you locate distant objects

that might be difficult to find in the narrow field of view of the main spotting scope.

1. Attach the finderscope and bracket by sliding the rubber O-ring over the eyepiece lens

(narrow) end of the finderscope and roll it 1/3 of the way up the finderscope body. Then

insert the eyepiece lens end of the finder through the rings in the bracket until the O-ring

presses tightly between the finderscope and the inside of the bracket. Tighten the two

adjustment screws until they make contact with the finderscope body.

2. Slide the finder bracket (attached to the finderscope) into the mounting bracket on the

spotting scope. Tighten the thumb screw on the mounting bracket to hold the finderscope in

place. See figure 3

Aligning the Finderscope

The 6x30mm finder is adjusted using two adjustment screws, located on the top and on the right

(when looking though the finder) of the finder bracket and a spring loaded pivot screw (located on the

left side of the bracket). This allows you to turn the top adjustment screw to move the finderscope up

and down, and turn the right adjustment screw to move the finderscope right to left. The spring

loaded pivot screw puts constant pressure on the finder so that the adjustment screws are always

making contact with the finder.

To align the finderscope:

1. Choose a target in excess of one mile away. This will eliminate any possible parallax effect.

2. Point the spotting scope at your target and center it in the eyepiece of the spotting scope.

3. Adjust the screws on the finder bracket until the cross hairs in the finder are centered on the

target.

Figure 3

4. Tighten each screw a quarter turn so the finder does not come loose.

Using Your Spotting Scope Visually

With the standard accessories attached, you are ready for your first look.

1. Point the front end of the spotting scope at a distant object.

2. Locate the object in the finderscope.

3. Look through the spotting scope and turn the focus knobs until objects come to a sharp focus.

4. Center your target using the slow motion controls of the tripod.

Repeat this process for each object you observe.

Focusing

For objects closer than the one you are currently observing, turn the focus knobs towards the eyepiece

and for objects further away, turn the focus knobs away from the eyepiece.

Changing Eyepieces

You can vary the power of your spotting scope simply by changing eyepieces. To change eyepieces:

1. Loosen the thumbscrew on the 45° Erect Image Diagonal.

2. Remove the eyepiece currently in the spotting scope.

3. Insert a new eyepiece into the 45° Erect Image Diagonal.

4. Tighten the thumbscrew on the 45° Erect Image Diagonal to hold the eyepiece in place.

With the new eyepiece in place you will need to refocus your spotting scope (unless the eyepieces

have the same focus point, something known as being parfocal). Once again, turn the focusing knob

until the image is sharp.

Celestron offers a wide variety of eyepieces as optional accessories. To determine the magnification

of each eyepiece used with your spotting scope, see the section “Calculating Magnification” at the

end of this manual.

In addition to eyepieces, you may also use a Barlow lens to increase magnification. A Barlow lens is

a negative lens that increases the focal length of a spotting scope. Used with an eyepiece it increases

the magnification. The amount of the increase depends on the lens itself and its position in the optical

system. Celestron offers Barlow lenses for 1-1/4” eyepieces.

Using Your Spotting Scope Photographically

Your Spotting Scope can be used photographically as well as visually. To turn your spotting scope into a

telephoto lens all you need is a T-Ring for your particular camera make (i.e., Nikon, Minolta, Pentax, etc.). The

T-Ring replaces the 35mm SLR camera’s normal lens.

Attaching a Camera

To attach a camera to your 80ED spotter:

1. Remove all visual accessories.

2. Thread the proper T-Ring onto the built-in T-Adapter threads at the end of the 1.25" eyepiece

adapter.

3. Mount your camera body onto the T-Ring the same as you would any other lens.

Focusing The Camera

The focusing mechanism is the same photographically and visually. However, due to the high

magnification, the micro prism focuser in your camera may "black out." If this is the case, you will

have to use the ground glass portion of your focusing screen, which itself may be dark. For the best

results, take your time. Look at your subject carefully to make sure that you have the sharpest

possible focus. To achieve a very sharp focus, consider using a focusing magnifier. These devices are

readily available from your local camera store.

If you can not get a sharp focus, check to see if your subject is closer than the near focus distance

listed in the "Technical Specification" section.

Storing Your Spotting Scope

To minimize the need to clean your spotting scope, replace all lens covers after use. The spotting

scope can be left on a tripod for display purposes or returned to its shipping carton. Since the rear cell

of your spotting scope is not sealed, the eyepiece or protective cover MUST be placed over the

opening in the rear cell when not in use. This will prevent contaminants from entering the optical

system.

Built-in T-Adapter

Threads

1 ¼” Eyepiece

Adapter Focuser Tension

Focuser Knob

2” Focuser

Barrel

Figure 4

Technical Specifications

Below is pertinent technical information on your 80ED spotting scope that you may

find useful.

80ED

Optical System Refractor

Aperture: 80mm (3.15")

Focal Length: 600mm (23.5")

Near Focus: with included eyepiece ~20'

Useful Power Range: 12x to 189x

Linear Field of View: 116' with 25mm Eyepiece

Angular Field of View: 2.2° with 25mm Eyepiece

F/ratio: f/7.5

Length: 22"

Weight: 7.5 lbs

Note: All specifications are stated for the 80ED spotting scope using the standard accessories.

These specifications are approximate and may change without notice.

VISUAL OBSERVING INFORMATION

Focusing

When working with any optical instrument, there are several focusing hints that will ensure that you

get the sharpest possible image. The hints listed here are for visual observing and photography.

Never look through glass. Glass found in household windows is optically imperfect and may vary in

thickness from one location 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 focus. In some

cases, you may actually see a double image.

Avoid looking across or over objects that are producing heat waves. This includes asphalt parking

lots on hot summer days or building rooftops. The turbulent air caused by these conditions makes it

impossible to get a truly sharp focus.

Avoid hazy skies, fog, and mist, all of which can make it difficult to focus, thus greatly reducing the

amount of detail seen. Remember that no matter how good the optics of your instrument are, they can

NOT perform to their fullest under adverse conditions.

Calculating Magnification (Power)

You can change the magnification of your spotting scope simply by changing the eyepiece (also

called an ocular). To determine the magnification with your spotting scope, simply divide the focal

length of your spotting scope by the focal length of the eyepiece. In equation format, the formula

looks like this:

Focal Length of Spotting Scope (mm)

Magnification = ___________________________________________________

Focal Length of Eyepiece (mm)

For example, to determine the magnification of the 80ED with a 25mm eyepiece, divide the focal

length of the spotting scope (600mm) by the focal length of the eyepiece (25mm). 600 divided by 25

yields 24 power.

Although the power is variable, each instrument 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, in a 3.2” diameter

spotting scope, such as the 80ED, the maximum useful magnification is 192 power. This is derived

from multiplying 60 times 3.2”. Although this is the maximum useful magnification, most observing

is done in the range of 20 to 35 power for every inch of aperture which for the 80ED is 64 to 112.

Field of View

Determining the field of view is important if you want to get an idea of the 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 (in degrees) =

Magnification

Using the example we started with in the previous section, we can determine the field of view using

the same 25mm eyepiece. The 25mm eyepiece has an apparent field of view of 52°. Divide the 52° by

the magnification, which is 24 power. This yields an actual field of 2.2°. To convert this to feet at one

thousand yards, multiply the actual field of 2.2° by 52.5. This gives us a field width of 116 feet at one

thousand yards.

PHOTOGRAPHY HINTS

Metering

Celestron spotting scopes have fixed apertures and, as a result, fixed f/ratios. To properly expose your

subjects photographically, you need to set your shutter speed accordingly. Most 35mm SLR cameras

offer through-the-lens metering which lets you know if your picture is under or overexposed.

Adjustments for proper exposures are made by changing the shutter speed. Consult your camera

manual for specific information on metering and changing shutter speeds.

Reducing Vibration

Releasing the shutter manually can cause vibrations,

producing blurred photos. To reduce vibration when

tripping the shutter, use a cable release. A cable release

keeps your hands clear of the camera and lens, thus

eliminating the possibility of introducing vibration.

Mechanical shutter releases can be used, though air-

type releases are best.

Blurry pictures can also result from shutter speeds that

are too slow. To prevent this, use films that produce

shutter speeds greater than 1/250 of a second when hand-holding the lens. If the lens is mounted on a

tripod, the exposure length is virtually unlimited.

Another way to reduce vibration is with the Vibration Suppression Pads (#93503). These pads rest

between the ground and tripod feet. They reduce the vibration amplitude and vibration time.

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