NATIONAL GEOGRAPHIC 50/360 Teleskop Telescope Instruction Manual

: June 4, 2024
: NATIONAL GEOGRAPHIC

NATIONAL GEOGRAPHIC 50/360 Teleskop 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.
Safety Icon

TELESCOPE

Product Description

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 (12.5 mm, 20 mm)
Telescope (Telescope tube)
Lens hood
Objective lens
Locating screw for the vertical fine adjustment (for moving upward and downward)
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, without having to adjust the tripod.
Use the locating screw for the vertical fine adjustment (7) 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 / 12.5 mm = 29X 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).

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.

WARNING:
Choking hazard — This product contains small parts that could be swallowed by children. This poses a choking hazard.

MICROSCOPE

MICROSCOPE DESCRIPTION

General Warnings

WARNING! Not for children under three years. Choking hazard – small parts. Contains functional sharp edges and points!
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ATTENTION: Only suitable for children of at least 8 years of age. Instructions for parents or other responsible persons are enclosed and must be followed. Keep packaging as it contains important information.

Choking hazard — This product contains small parts that could be swallowed by children. This poses a choking hazard.
Risk of electric shock — This device contains electronic components that operate via a power source (batteries). Only use the device as described in the manual, otherwise you run the risk of an electric shock.
Risk of fire/explosion — Do not expose the device to high temperatures. Use only the recommended batteries. Do not short-circuit the device or batteries, or throw them into a fire. Excessive heat or improper handling could trigger a short-circuit, a fire or an explosion.
Risk of chemical burn — Make sure you insert the batteries correctly. Empty or damaged batteries could cause burns if they come into contact with the skin. If necessary, wear adequate gloves for protection.
Leaking battery acid can lead to chemical burns. Avoid contact of battery acid with skin, eyes and mucous membranes. In the event of contact, rinse the affected region immediately with a plenty of water and seek medical attention.
Use only the recommended batteries. Always replace weak or empty batteries with a new, complete set of batteries at full capacity. Do not use batteries from different brands, types or with different capacities. Remove the batteries from the unit if it is not to be used for a long period of time, or if the batteries are empty!
Never recharge normal, non-rechargeable batteries. This could lead to explosion during the charging process.
Rechargeable batteries are only to be charged under adult supervision.
Rechargeable batteries are to be removed from the toy before being charged
The terminals must not be short-circuited.
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.
Tools with sharp edges are often used when working with this device. Because there is a risk of injury from such tools, store this device and all tools and accessories in a location that is out of the reach of children.
Keep instructions and packaging as they contain important information.

Parts overview

Zoom Eyepiece and Eyecup
Focus knob
Objective turret
Stage
On/off switch (illumination)
Electronic light source
Base with battery compartment
Battery compartment
Cover plates
Blank Slides and Prepared slide
Reservoir and Yeast
Tweezers
Wheel with pinhole apertures
Measuring cup
Hatchery
Smartphone holder

What is a microscope?

A microscope contains two lens systems: the eyepiece and the objective. We’re presenting these systems as one lens each so that the concept is easier to understand. In reality, however, the eyepiece (1) and the objective in the turret (3) are made up of multiple lenses.

The lower lens (objective) produces a magnified image of the prepared specimen (10). The picture, which you can’t see, is magnified once more by the second lens (eyepiece, 1), which you can see as the ‘microscope picture’.

Assembly and location

Before you start, choose an ideal location for using your microscope. It’s important that you choose a spot with enough light for normal observation. Furthermore, it is recommended that you place the microscope on a stable surface, because a shaky surface will not lead to satisfactory results.

Normal observation

For normal observation, place the microscope in a bright location (near a window or desk lamp, for example). Turn the focus knob (2) to the upper stop, and set the objective turret (3) to the lowest magnification.

Now, turn on the light using the switch on the microscope base. You’ll find further tips about the light source in the next section. Now, place a prepared slide (10) under the clips on the stage (4), directly under the objective (1). When you take a look through the eyepiece, you can see the magnified specimen. At this point, you still might see a slightly fuzzy picture. Adjust the image sharpness by slowly turning the focus knob (2). You can now select a higher magnification by turning the objective turret and selecting a different objective.

When you do so, note that the sharpness of the picture must be adjusted again for the higher magnification. Also, the higher the magnification, the more light you will need for good illumination of the picture.

The wheel with pinhole apertures (13) below the microscope stage (4) will help you in viewing very bright or clear-sighted preparations. Turn the wheel (13) till the best contrast is achieved.

Observation (electronic light source)

Observation

For observation with the electronic light source (6) you need to insert 2 AA batteries 1.5 V, in the battery compartment (8) on the base of the microscope (7). The battery compartment is opened using a Phillips screwdriver. Insert the batteries with the correct polarity (+/- indication). Put the battery cover first into the small opening so that the lid fits perfectly. Now you can tighten the screw. The lighting is switched on when you turn the switch on the microscope base. Now you can observe in the same way as described in the previous section.

TIP: The higher the magnification you use the more light is required for a good illumination of the picture. Therefore, always start your experiments with a low magnification.

Smartphone holder

Attach the smartphone holder to the eyepiece.

The suction cups must be clean and free from dust and dirt. A slight moistening is helpful.
Now press your smartphone on the retaining plate and make sure that it is properly secured.
As a backup, you should secure it with the enclosed rubber strap. Smartphones with a rough surface will not hold as good as smartphones with a smooth surface.

Now start the Camera app.
The camera needs to rest just above the eyepiece. Center the smartphone exactly over the eyepiece, so the image can be seen precisely centered on your screen.
In some cases you need to adjust with the zoom function to display the image fullscreen. A light shading at the edges is possible.

Take the smartphone carefully off the holder after use.

NOTE:
Make sure that the smartphone can not slip out of the holder.
Bresser GmbH assumes no liability for any damages caused by a dropped smartphone

Condition and prepare viewed objects

Condition
This microscope features transmitted light, so that transparent specimens can be examined.
If opaque specimens are being examined, the light from below goes through the specimen, lens and eyepiece to the eye and is magnified en route (direct light principle).
Some small water organisms, plant parts and animal components are transparent by nature, but many others require pretreatment — that is, you need to make a thinnest possible slice of the object by hand cutting or using a microtome, and then examine this sample.

Creation of thin preparation cuts
Specimens should be sliced as thin as possible. A little wax or paraffin is needed to achieve the best results. Put the wax into a heat-safe bowl and heat it over a flame until the wax is melted. You can use a candle flame to melt the wax.

DANGER!
Be exremely carfeful when dealing with hot wax, as there is a danger of being burned.

Then, dip the specimen several times in the liquid wax. Allow the wax that encases the specimen to harden. Use a MicroCut or other small knife or scalpel to make very thin slices of the object in its wax casing.

DANGER!
Be extremely careful when using the MicroCut, knife or scalpel. These instruments are very sharp and pose a risk of injury

Place the slices on a glass slide and cover them with another slide before attempting to view them with the microscope.

Creation of your own preparation

Put the object to be observed on a glass slide and cover the object with a drop of distilled water using the pipette (12).

Set a cover glass (available at a well-stocked hobby shop) perpendicular to the edge of the water drop, so that the water runs along the edge of the cover glass. Now lower now the cover glass slowly over the water drop.

Experiments

Use the following web link to find interesting experiments you can try out.
https://www.bresser.de/downloads

Microscope accessories can be found here:
https://www.bresser.de/en/Junior/Microscopy
https://www.bresser.de/P8859480

Notes on Cleaning

Before cleaning the device, disconnect it from the power supply by removing the plug or batteries.
Only use a dry cloth to clean the exterior of the device. To avoid damaging the electronics, do not use any cleaning fluid.
Protect the device from dust and moisture.
The batteries should be removed from the unit if it has not been used for a long time.

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/9118400/CE/9118400_CE.pdf

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.

Do not dispose of electronic devices in the household garbage!
As per Directive 2002/96/EC of the European Parliament on waste electrical and electronic equipment and its adaptation into German law, used electronic devices must be collected separately and recycled in an environmentally friendly manner.
Empty, old batteries must be disposed of at battery collection points by the consumer. You can find out more information about the disposal of devices or batteries produced after 6 January 2006 from your local waste-disposal service or environmental authority.

In accordance with the regulations concerning batteries and rechargeable batteries, disposing ofthem in the normal household waste is explicitly forbidden. Please make sure to dispose of your used batteries as required by law — at a local collection point or in the retail market. Disposal in domestic waste violates the Battery Directive.

Batteries that contain toxins are marked with a sign and a chemical symbol.

battery contains cadmium
battery contains mercury
battery contains lead

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.

Support

Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education.

TO LEARN MORE, VISIT NATGEO.COM/INFO

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Visit our website: kids.nationalgeographic.com

Bresser GmbH
Gutenbergstr. 2 · DE-46414 Rhede
www.bresser.de
info@bresser.de