NATIONAL GEOGRAPHIC 9118001 Table Telescope Instruction Manual
- June 6, 2024
- NATIONAL GEOGRAPHIC
Table of Contents
NATIONAL GEOGRAPHIC 9118001 Table Telescope Instruction Manual
WARNING:
Never use this device to look directly at the sun or in the direct
proximity of the sun. Doing so may result in a risk of blindness.
General Warnings
- Risk of blindness — Never use this device to look directly at the sun or in the direct proximity of the sun. Doing so may result in a risk of blindness.
- Choking hazard — Children should only use the device under adult supervision. Keep packaging material, like plastic bags and rubber bands, out of the reach of children, as these materials pose a choking hazard.
- Risk of fire — Do not place the device, particularly the lenses, in direct sunlight. The concentration of light could cause a fire.
- Do not disassemble the device. In the event of a defect, please contact your dealer. The dealer will contact the Service Centre and can send the device in to be repaired, if necessary.
- Do not expose the device to high temperatures.
- The device is intended only for private use. Please heed the privacy of other people. Do not use this device to look into apartments, for example.
Parts overview
- Focus wheel
- Zenith mirror
- Eyepieces (6 mm, 20 mm)
- Telescope (Telescope tube)
- Lens hood
- Objective lens
- Locating screw for the vertical fine adjustment (for moving upward and downward)
- Locating screw for the vertical axis (for turning to the right and left)
- Tripod legs
You should take some time to decide where you would like to set up your
telescope. Choose a stable surface like a table. Mount the telescope to the
tripod with the locating screw for the vertical fine adjustment (7) ( Fig.
1 ). You can now place the zenith mirror (2) into the eyepiece holder and
secure it with the small
screw on the connector ( Fig. 2 ). Next, set the eyepiece (3) into the
opening of the zenith mirror (2) (Fig. 2). Here too, there is a screw with
which you can screw the eyepiece onto the zenith mirror.
Note: First, put the eyepiece with the largest focal width (e.g. 20 mm) onto the zenith mirror. While you’ll get the least amount of magnification, it will be easier for you to view things.
Azimuthal mounting
Azimuthal mounting means that you can move your telescope up and down, left and right, without having to adjust the tripod.
Use the locating screw for the vertical fine adjustment (7) and the locating screw for the vertical axis (8) to locate and lock onto the position of an object (to focus an object).
Which eyepiece is right?
It is important that you always choose an eyepiece with the highest focal
width at the beginning of your observation. Afterward, you can gradually move
to eyepieces with smaller focal widths. The focal width is indicated in
millimetres and is written on each eyepiece. In general, the following is
true: the larger the focal width of an eyepiece, the smaller the
magnification. There is a simple formula for calculating the magnification:
Focal width of the telescope tube : Focal width of the eyepiece = Magnification
The magnification also depends on the focal width of the telescope tube. This telescope contains a tube with a focal width of 360 mm.
Examples:
360 mm / 20 mm = 18X magnification
360 mm / 6 mm = 60X magnification
Focus wheel
Look through the telescope eyepiece (3) and hone in on a far away object that you can see well (for instance, a church tower). Focus in on the object with the focus knob (1) in the way shown in Fig. 3.
Technical data
- Design: achromatic
- Focal width: 360 mm
- Objective diameter: 50 mm
Notes on cleaning
- Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microfibre cloth. To avoid scratching the lenses, use only gentle pressure with the cleaning cloth.
- To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-cleaning solution, and wipe the lenses gently.
- Protect the device from dust and moisture. After use, particularly in high humidity, let the device acclimatise for a short period of time, so that the residual moisture can dissipate before storing.
Possible observation targets
The following section details several interesting and easy-to-find celestial objects you may want to observe through your telescope.
The Moon
The moon is Earth’s only natural satellite.
Diameter: 3,476 km / Distance: 384,400 km from Earth (average)
The moon has been known to humans since prehistoric times. It is the second brightest object in the sky, after the sun. Because the moon circles the Earth once per month, the angle between the Earth, the moon and the sun is constantly changing; one sees this change in the phases of the moon. The time between two consecutive new moon phases is about 29.5 days (709 hours).
Constellation Orion: The Orion Nebula (M 42)
Right Ascension: 05h 35m (hours : minutes) / Declination: -05° 22′ (Degrees :
minutes) Distance: 1,344 light years from Earth
Though it is more than 1,344 light years from Earth, the Orion Nebula (M 42) is the brightest diffuse nebula in the sky. It is visible even with the naked eye and a worthwhile object for telescopes of all types and sizes. The nebula consists of a gigantic cloud of hydrogen gas with a diameter of hundreds of light years.
Constellation Lyra: The Ring Nebula (M 57)
Right Ascension: 18h 53m (hours : minutes) / Declination: +33° 02′(Degrees :
minutes) Distance: 2,412 light years from Earth
The famous Ring Nebula (M57) in the Lyra constellation is often viewed as the prototype of a planetary nebula. It is one of the magnificent features of the Northern Hemisphere’s summer sky. Recent studies have shown that it is probably comprised of a ring (torus) of brightly shining material that surrounds the central star (only visible with larger telescopes), and not a gas structure in the form of a sphere or an ellipse. If you were to look at the Ring Nebula from the side, it would look like the Dumbbell Nebula (M 27). When viewed from Earth, we are looking directly at the pole of the nebula.
Constellation Vulpecula (Little Fox):
The Dumbbell Nebula (M 27)
Right Ascension: 19h 59m (hours : minutes) / Declination: +22° 43′ (Degrees :
minutes) Distance: 1,360 light years from Earth
The Dumbbell Nebula (M 27) was the first planetary nebula ever discovered. On 12 July 1764, Charles Messier discovered this new and fascinating class of objects. We see this object almost directly from its equatorial plane. If we could see the Dumbbell Nebula from one of its poles, we would probably see the shape of a ring, something very similar to what we know as the Ring Nebula (M 57). In reasonably good weather, we can see this object well, even with low magnification.
Telescope ABC’s
What do the following terms mean?
Eyepiece (3):
An eyepiece is a system made for your eye and comprised of one or more lenses.
An eyepiece captures and magnifies the clear image that is generated in the
focal point of a lens even more.
There is a simple formula for calculating the magnification:
Focal width of the telescope tube / Focal width of the eyepiece =
Magnification
In a telescope, the magnification depends on both the focal width of the telescope tube and the focal width of the eyepiece. From this formula, we see that if you use an eyepiece with a focal width of 20 mm and a telescope tube with a focal width of 360 mm, you will get the following magnification: 360 mm / 20 mm = 18 times magnification
Focal width:
Everything that magnifies an object via an optic (lens) has a certain focal
width. The focal width is the length of the path the light travels from the
surface of the lens to its focal point. The focal point is also referred to as
the focus. In focus, the image is clear. In the case of a telescope, the focal
widths of the telescope tube and the eyepieces are combined.
Lens:
The lens turns the light which falls on it around so that the light gives a
clear image in the focal point after it has traveled a certain distance (focal
width).
Magnification:
The magnification corresponds to the difference between observation with the
naked eye and observation through a magnification apparatus (e.g. a
telescope). Observation with the eye is considered ‘single’, or 1X
magnification. Accordingly, if a telescope has a magnification of 18X, then an
object viewed through the telescope will appear 18 times larger than it would
with the naked eye. See also ‘Eyepiece’.
Zenith mirror (2):
A mirror that deflects rays of light at a 90 degree angle. With a horizontal
telescope tube, this device deflects the light upwards so that you can
comfortably observe by looking downward into the eyepiece. The image in a
zenith mirror appears upright, but rotated around its vertical axis (what is
left appears right and vice versa).
EC Declaration of Conformity
Bresser GmbH has issued a “Declaration of Conformity” in accordance with
applicable guidelines and corresponding standards. The full text of the EU
declaration of conformity is available at the
following internet address:
www.bresser.de/download/9118001/CE/9118001_CE.pdf
UKCA Declaration of Conformity
Bresser GmbH has issued a „Declaration of Conformity“ in accordance with
applicable guidelines and corresponding standards. The full text of the UKCA
declaration of conformity is available at the following internet address:
www.bresser.de/download/9118001/UKCA/9118001_UKCA.pdf
Bresser UK Ltd. • Suite 3G, Eden House, Enterprise Way, Edenbridge, Kent
TN8 6Hf, Great Britain
DISPOSAL
Dispose of the packaging materials properly, according to their type, such as paper or cardboard. Contact your local waste-disposal service or environmental authority for information on the proper disposal.
Please take the current legal regulations into account when disposing of your device. You can get more information on the proper disposal from your local waste-disposal service or environmental authority.
Warranty and Service
The regular guarantee period is 5 years and begins on the day of purchase. You can consult the full guarantee terms and details of our services at: www.bresser.de/warranty_terms.
National Geographic Partners LLC. All rights reserved.
NATIONAL GEOGRAPHIC KIDS and Yellow Border Design are trademarks of National
Geographic Society, used under license.
Visit our website:
kids.nationalgeographic.com
Bresser GmbH
Gutenbergstr. 2
46414 Rhede
Germany
www.bresser.de
info@bresser.de
Bresser UK Ltd.
Suite 3G, Eden House
Enterprise Way, Edenbridge,
Kent TN8 6Hf, Great Britain
References
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