National Geographic NG 91 Bedienungsanleitung

Please retain the information in

this manual for future reference.

Colour, designs and decorations may vary

from those shown in the photographs.

Item no. NG 91

Printed in China

INSTRUCTION

MANUAL

INSTRUCTION

MANUAL

50mm

ASTRONOMICAL

TELESCOPE

50mm

ASTRONOMICAL

TELESCOPE

AGES 8 AND UP

WARNING!

Do not view the sun through

the telescope as serious injury

to the eye may occur.

Telescopes should

always be used under

adult supervision.

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1 2

PARTS OF YOUR TELESCOPE

Lens hood

Lens cap

(not shown)

Focus

wheel

Erecting

eyepiece

Tripod

8.3mm eyepiece

Diagonal

mirror

16.6mm

eyepiece

Focus tube

Telescope tube

INTRODUCTION

With proper care and handling, you will enjoy looking at nature’s sights

for many years. This telescope has been designed for both

astronomical and terrestrial viewing, so you can not only gaze into the

night sky, but also view mountains, birds and animals at a distance.

When you stand outside and look at the sky on a clear night, you can

normally see masses of stars without using a telescope. The telescope

is really a light-gathering instrument that also magnifies the view, so

you can see far more detail.

If you only see black or grey when looking through the telescope,

it could be you are using an eyepiece with too high a magnification,

so swap to the lower-power eyepiece and check again. Using the

higher-powered eyepiece will make objects seem darker. This is

because when magnification in a telescope increases, brightness is

reduced.

As well as searching for stars with your telescope, the moon is also a

great target. The best time to look at the moon is when it is less than

half full, because the dividing line between the dark and light of the

moon (called the terminator) shows the best detail in the craters and

mountains.

You should be able to see stars and even planets with your telescope

(weather conditions permitting). The stars will twinkle and the planets,

although as bright, will show as constant lights. Looking at the Internet

with the permission or assistance of an adult will help you find star

maps and charts to help you identify objects in the universe. You can

also buy astronomy magazines that advise the locations of planets as

they change from month to month.

ASSEMBLY

1. Carefully remove all parts

from the box.

2. Stand the tripod vertically

and spread the three legs

fully apart.

3. Fit the telescope tube to the

tripod bracket and secure it

using the bolt and wing nut

provided.

3 4

ABOUT MAGNIFICATION

The magnification 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

determine the magnification. To calculate the magnification of your

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

the telescope (500mm) by the focal length of the eyepiece (indicated in

‘mm’ on the eyepiece collar).

The erecting eyepiece used for viewing terrestrial objects and

landscapes has a focal length of 12 mm, providing a magnification of

41X.

The two eyepieces included

provide the following

magnification:

eyepiece 8.3mm = 60.24X

eyepiece 16.6mm = 30.12X

USING THE IMAGE ERECTOR

For viewing terrestrial

(land-based objects),

remove the diagonal

mirror from the focus

tube by unscrewing

the thumbscrew and

pulling out as shown.

Fit the image erector to the end of the focus tube and secure with the

thumbscrew.

500mm focal length tube = 30.12 X magnification

16.6mm focal length eyepiece

EXAMPLE

5. For greater magnification,

release the thumbscrew

securing the 16.6 mm

eyepiece, remove and

replace with the 8.3 mm

eyepiece.

4. Fit the eyepieces like this:

We suggest you fit the 16.6mm eyepiece first.

The 16.6 and 8.3mm

eyepieces fit like this.

The erecting eyepiece fits

like this.

5 6

USING YOUR TELESCOPE

1. The best way to use your telescope is outside, because viewing

through windows (even if they are open) can be distorted by

reflections from the glass or by air currents (differing

temperatures) passing through a window.

2. Let your telescope adjust to the outside temperature before use.

Your telescope will work better if the lenses and the air inside the

tube are the same temperature as outside, so give it up to

30 minutes to equalise.

3. Try to find a viewing spot that is away from glaring lights. If you live

in a city, your viewing can be reduced by too much lighting, and it's

best to use the telescope where it is as dark as possible.

4) Try to avoid sudden changes of temperature, as this may cause

condensation on your lens. (For example, carrying your telescope in

from a very cold wintry outside to a very warm house interior). If this

occurs, leave the lens cap off, tilt the lens face down and wait till the

telescope reaches room temperature before storing it.

5) When you remove your telescope from its box, the diagonal mirror

and low-power 16.6 mm eyepiece are already fitted. It is

recommended that you start viewing the moon and stars with the

16.6mm eyepiece because it gives you the widest angle with the

brightest and sharpest views. Once you have completed assembly,

adjust the angle of the telescope by first releasing the

bolt and wing nut that secures the telescope tube to the tripod

bracket. Move the telescope as desired, and secure with the bolt and

wing nut, being careful not to over-tighten.

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 problem. When using the erecting

eyepiece, objects will appear right-side up and in the correct

orientation (not reversed).

TAKING CARE OF YOUR TELESCOPE

The lens and eyepieces in your telescope can get dirty over time, and

utmost care must be taken when cleaning them. Here are some tips for

keeping your telescope in good working order:

1. Keep the dust caps on when not in use or when transporting the

telescope.

2. Condensation can occur when the telescope is not in use. If this

happens, remove the dust caps and allow the moisture to evaporate

naturally. While doing this, keep the telescope pointing downwards

to avoid dust accumulate on. Replace the cap as soon as the

condensation has gone.

3. If the lens looks like it is dusty, try blowing away any particles. If

your lens requires more cleaning then use a moistened lens tissue

or cloth (not included).

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