National Geographic NG60AZ Guide de démarrage rapide

NG60AZ Telescope

Instructions

and

Owner’s Manual

WARNING!

NEVER aim your telescope at the sun or even close to the sun!

Instant and irreversible damage can occur,

including blindness!

Do not let children use any telescope without adult supervision.

. Accessory tra

B. Finder scope

C. Finder scope bracket

D. Diagonal mirror

E. 3X Barlow lens

F. Image erector

G. Eyepieces

H. Eyepiece cases

I. Yoke

J. Tripod support bracket

K. Vertical fine adjustment rod

L. Screwdriver

M. Altitude control locking

knobs (2)

N. Tripod leg attachment bolts and

wing nuts (3)

O. Tripod leg adjustment knobs (3)

P. Optical tube assembly

Q. Dew shield

R. Tripod leg (3)

Parts of your NG60AZ Telescope:

Introduction

Congratulations on your purchase of a precision-crafted NATIONAL GEOGRAPHIC™

telescope. With proper care and handling of your telescope, you will enjoy the pleasure

of looking at nature’s wondrous sights through the eye of this instrument for many

years.

The NG60AZ has been designed to provide views of the moon’s craters, Jupiter’s major

moons, and Saturn’s rings, in addition to dozens of galaxies, star clusters, and nebulae.

As a terrestrial (land) telescope, the NG60AZ delivers great views of mountains, valleys,

and many other features of the world around us. You can also use the NG60AZ to study

animals and landscapes at a distance. To obtain the best performance from your

telescope, please read this manual carefully and completely.

WARNING!

CHOKING HAZARD

Small parts. Not suitable for

children under 3 years.

ASSEMBLY

1) Carefully remove all parts from the cardboard cartons and lay them on a table or

on the floor in order to take an inventory of all the pieces. Keep your box for storage

or in case you ever need to ship your telescope.

2) Extend the legs, and lock each one at the desired height with the supplied tripod

adjustment knob (See Fig. 1).

(Fig. 1)

3) Connect all three tripod legs to the yoke with the supplied tripod leg attachment

bolts, washers, and wing nuts (See Fig. 2).

(Fig. 2)

4) Fasten the tripod support bracket to each leg using the included bolts and nuts that

come attached to the end of each arm of the tripod support bracket. Remove each

bolt and nut (See Fig. 3). Then position one arm of the tripod support bracket so that

Azimuth Locking Knob

the holes at the end of the arm line up with the hole through the attachment point on

the tripod leg (See Fig. 4). Insert the bolt to attach the tripod support bracket to the

tripod leg and tighten the nut. Repeat this procedure with the other two legs.

(Fig. 3) (Fig. 4)

5) Fasten the accessory tray to the tripod support bracket by placing the tray’s bolt

into the threaded hole and turning the tray clockwise until tight (See Fig. 5).

(Fig. 5)

6) After all nuts and bolts have been firmly tightened, the telescope optical tube

assembly can be attached to the yoke. Mount the optical tube assembly in the yoke as

shown in Fig. 6 and tighten the two altitude control locking knobs.

(Fig. 6)

7) Locate the vertical fine adjustment rod. It is a chrome-plated metal rod about 6

inches long. Insert the smooth end into the chromed holder located on the side of the

yoke (See Fig. 7). You may have to loosen the large locking knob in order to insert

the chromed rod. Once the rod is inserted (with the end with the hole facing the

focusing assembly) tighten the large locking knob just enough to prevent the rod from

falling out. Locate the chromed post on the side of the telescope tube near the

focusing assembly. Remove the screw from the post. Insert it through the hole in the

end of the vertical fine adjustment rod and into the post. Turn the screw clockwise

until it is tight (See Fig. 8).

(Fig. 7) (Fig. 8)

8) Remove the finder scope (with attached bracket) from the box. Remove the two

knurled thumbscrews from the telescope main tube (See Fig. 9). Position the finder

scope bracket onto the telescope tube so that the holes in the base of the bracket

line up with the exposed holes in the telescope tube. Replace the two knurled

thumbscrews and tighten securely (See Fig. 10).

(Fig. 9) (Fig. 10)

9) Insert the diagonal mirror into the focusing tube (See Fig. 11). Secure by tighten-

ing the small chrome set screw located on the focusing tube (See Fig. 12).

(Fig. 11) (Fig. 12)

10) Insert the 25-mm eyepiece into the diagonal mirror (See Fig. 13). Tighten the

small chrome set screw to hold the eyepiece securely in place (See Fig. 14).

(Fig. 13) (Fig. 14)

11) A 3X Barlow lens is supplied to triple the basic magnifying power provided by an

eyepiece. In viewing situations where very high magnifying powers are desired, insert

the 3X Barlow lens between the eyepiece and the focusing tube (See Fig. 15).

(Fig. 15)

FINDER SCOPE ALIGNMENT

Since a telescope has a narrow field of view by design, it can be challenging to locate a

particular star or planet. For this reason the telescope is fitted with a low-power, wide-

field miniature telescope called a finder scope. Always use your finder scope to locate

the object you want to view FIRST. The finder scope should be aligned with the

main telescope tube before you begin using the telescope, in order that both

scopes are positioned to always provide exactly the same angle and view.

Note: Objects in the finder scope are upside down. This is normal and is common to all

astronomical telescopes.

Complete the following settings in daylight:

1) Insert the 25-mm eyepiece into the diagonal mirror. Look at an easily recognizable,

stationary object that is at least 300 feet away. Slightly loosen the two altitude control

locking knobs, the azimuth locking knob (See Fig. 2 on page 4), and the vertical fine

adjustment rod. Turn the telescope on both its horizontal and vertical axis until the

object is in the center of the field of view. Then bring the image into focus.

2) Firmly retighten the adjusting knobs and the vertical fine adjustment rod so that the

telescope is locked in position.

3) Look through the finder scope. If the object is not visible or centered in the finder

scope, simply release one of the three small adjusting screws holding the finder scope

and reposition the finder scope until the object is centered within the X-shaped

crosshairs.

4) All screws should be completely tightened as soon as the view through the finder

scope coincides with the view of the main telescope.

5) You may need to repeat this procedure to ensure a perfect alignment.

THE ALTAZIMUTH MOUNT

The NG70CA telescope is fitted with an altazimuth mount. “Alt” refers to altitude, the

vertical movement of the telescope, while “azimuth” refers to the horizontal movement.

ABOUT MAGNIFICATION

The magnification power of a telescope indicates how much an image is enlarged or

how big and close it appears to the viewer. The focal length of the eyepiece, combined

with the focal length of the telescope, determines the magnification power. To calculate

the power of your telescope with any particular eyepiece, simply divide the focal length

of the telescope (700 mm) by the focal length of the eyepiece (indicated in “mm” on the

eyepiece collar).

Example: 700-mm focal length (tube) = 56X magnification power

12.5-mm focal length (eyepiece)

The 3X Barlow lens and interchangeable eyepieces provide the following magnification

values:

Eyepiece Power Power With 3X Barlow Lens

25 mm 28X 84X

12.5 mm 56X 168X

4 mm 175X 525X

The level of magnification required depends on the object being observed. Optimal

performance is obtained if the magnification is typically not more than about 30X for

every 10 mm of objective lens diameter. Magnification of around 175X or less is ideal

for a telescope with a 60-mm diameter objective lens and is best for observing most

celestial objects. A lower magnification power and a wider field of view are advisable for

observing galaxies and nebulae. The highest magnification power should be used for

highly detailed observations of the moon, Jupiter, Saturn, or any object that is quite

bright.

The highest magnification power of the Barlow lens/4-mm eyepiece combination should

only be used for large or bright objects such as the moon and the brightest planets.

USING YOUR TELESCOPE FOR ASTRONOMICAL VIEWING

1) Take your telescope outside. Viewing objects through closed or open windows is not

recommended. Your view can be distorted by reflections in the glass of a closed

window or by air currents of differing temperatures passing through an open window.

2) Let your telescope adjust to the outside temperature. Your telescope will perform

much better if the temperature of the lenses and the air inside the tube are the same

as outside temperature. It may take up to 30 minutes to equalize the temperatures

when the difference in temperatures is extreme.

3) Find a location far from glaring light. If you live in an urban area, your viewing will

probably improve the farther you move away from the city lights. The sky glow of a

town or city can dramatically reduce the telescope’s performance and viewing

capabilities.

4) Remove the large, round plastic dust cover from the front of your telescope.

5) We recommend starting your viewing with the 25-mm eyepiece because it gives you

the widest angle and brightest, sharpest views. To adjust the angle of the telescope,

loosen the azimuth lock knob by turning it counterclockwise (See Fig. 2 on page 4).

Then loosen the tilt and pan arm by turning it counterclockwise. You can then hold

the tilt and pan arm and aim the telescope in the desired direction. Then tighten the

tripod locking knob and the tilt and pan arm.

When possible, avoid sudden temperature changes, as the moisture in the air will

condense on the objective lens. Should this occur after bringing your telescope inside,

leave the lens cap off the objective lens, tilt the objective (front) lens facedown, and

allow the telescope to reach room temperature.

NOTE: When using the diagonal mirror, objects will appear right side up in your

telescope, but reversed, like a reflection in a mirror. This is normal, and does not

indicate a defect.

USING YOUR TELESCOPE FOR TERRESTRIAL VIEWING

You may notice that when you observe a terrestrial subject on land or water it appears

right side up, but is reversed — like looking in a mirror.

Use the 1.5X image erector, included with your telescope, to reorient the object. This

accessory is inserted in the eyepiece holder of the telescope between the eyepiece and

the telescope, in the same manner as the 3X Barlow lens (See Fig. 16).

(Fig. 16)

The image erector provides 1.5X magnification, which means that the 25-mm eyepiece

will magnify objects from 28X to 42X when used in conjunction with the image erector.

NOTE: Do not use the diagonal mirror or the 3X Barlow lens with this accessory.

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