BRESSER 9015000 NATIONAL GEOGRAPHIC 76/350 Compact Telescope User Manual
- June 9, 2024
- BRESSER
Table of Contents
COMPACT TELESCOPE
76/350
Operating instructions
Art.No. 9015000
SOFTWARE DOWNLOAD:
www.bresser.de/download/Stellarium
General Warning
Risk of bodily injury!
Never use this device to look directly at the sun or in the direct proximity
of the sun. This will result in a risk of blindness.
- 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 they pose a choking hazard.
- Never subject the device, especially the optics, to direct sunlight. The concentration of light can cause fires or burns.
- 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.
Privacy protection!
This device is intended only for private use. Please heed the privacy of other
people. Do not use it to look into apartments, for example.
Your telescope consists of these parts:
1. Focus wheel
2. Telescope (Telescope tube)
3. Compass
4. Alt-azimuth mount
5. Azimuth scale
6. Scale with 90° steps
7. Height adjustment wheel
Additional equipment:
8. Two Eyepieces (6 mm, 20 mm)
9. Barlow lens 2X
10. Moon filter
11. Software
Please look for a suitable location to set up your telescope before you begin. Use a stable surface like a table or countertop.
Pointing your telescope
Azimuthal mounting means that you can move your telescope up and down, left
and right.
With the height adjustment wheel (7) and the turnable azimuth mount, you can
point the telescope at any object you want. Use the wheel (7) to tilt the
telescope up and down. By using the azimuth mount like a turntable you can pan
the telescope to the left and to the right.
Which eyepiece is right?
It is important that you always choose an eyepiece with the highest focal width for the beginning of your observation. Afterwards, you can gradually move to eyepieces with smaller focal widths. The focal width is indicated in millimeters, and it is written on each eyepiece. In general, 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 is also depends on the focal width of the telescope tube. The telescope has a focal length of 350 mm. From this formula, we see that if you use an eyepiece with a focal width of 20 mm, you will get the following magnification:
350 mm / 20 mm = 18X magnification
The table below shows some common magnifications.
Telescope tube focal width| Focal width of eyepiece| Magnification|
Magnification with 2x Barlow lens
---|---|---|---
350 mm| 20 mm| 18X| 35X
350 mm| 6 mm| 58X| 117X
Astronomy Software Download
www.bresser.de/download/Stellarium
NOTES on cleaning
- Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microfibre cloth. Do not apply excess pressure to the cloth to avoid scratching the lenses.
- 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 acclimatize for a short period of time, so that the residual moisture can dissipate before storing. Remove the dust cover and store it in the included bag during use.
- To remove dust on the mirrors, use a fine brush or air blower (from your local camera shop or optician). Don’t touch any mirror surface with your fingers — they may damage the coating.
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.
Telescope ABC:
What do the following terms mean?
Barlow Lens:
The Barlow lens was named after its inventor, Peter Barlow, a British
mathematician and physicist who lived from 1776 1862. The lens can be used to
increase the focal width of a telescope. Depending on the type of lens, it is
possible to double or even to triple the focal width. As a result, the
magnification can also be increased. Also, see Eyepiece.
Focal width:
Everything that magnifies an object via an optic (lens/mirror) has a certain
focal width. The focal width is the length of the path the light travels from
the surface of the lens/mirror 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.
Mirror:
The mirror bends the light which falls on it in such a way that the light
creates a clear image at the focal point, after it has traveled a certain
distance (focal width).
Eyepiece:
An eyepiece is a viewing system comprised of one or more lenses. The eyepiece
magnifies the clear image generated at the focal point of a lens.
There is a simple formula for calculating 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.
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 naked eye is considered single, or 1x
magnification. Accordingly, if a telescope has a magnification of 30X, then an
object viewed through the telescope will appear 30 times larger than it would
with the naked eye. Also see Eyepiece.
Useful accessories can be found at www.bresser.de
Possible objects for observation:
We have compiled and explained a number of very interesting celestial bodies and star clusters for you. On the accompanying images at the end of the instruction manual, you can see how objects will appear in good viewing conditions through your telescope using the eyepieces that came with it.
The Moon
The moon is the Earth’s only natural satellite.
Diameter: 3,476 km
Distance: approx. 384,400 km from Earth
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).
Orion Nebula (M 42)
M 42 in the Orion constellation
Distance: 1,344 light years from Earth
With a distance of about 1,344 light years from the Earth, the Orion Nebula (Messier 42, abbreviation: M 42) is the brightest diffuse nebula in the sky it is visible with the naked eye and a rewarding object for telescopes in all sizes, from the smallest field glass to the largest earthbound observatories and the Hubble Space Telescope.
When talking about Orion, we’re actually referring to the main part of a much larger cloud of hydrogen gas and dust, which spreads out over the half of the Orion constellation. The expanse of this enormous cloud stretches several hundred light years.
Ring Nebula in Lyra constellation (M 57)
M 57 in the Lyra constellation
Distance: 2,412 light years from Earth
The famous Ring Nebula (M 57) in the constellation of Lyra 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 of 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 (M27). With this object, we’re looking directly at the pole of the nebula.
Dumbbell Nebula in the Vulpecula (Fox) constellation (M 27)
M 27 in the Fox constellation
Distance: 1,360 light years from Earth
The Dumbbell Nebula (M 27) in the Fox constellation 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 you could see the Dumbbell Nebula from one of its poles, it would probably reveal that it’s in the shape of a ring, and we would see something very similar to what we know from the Ring Nebula (M 57). In reasonably good weather, we can see this object well even at small magnifications.
Warranty
The regular warranty period is 2 years and begins on the day of purchase. To
benefit from an extended voluntary warranty period as stated on the gift box,
registration on our website is required.
You can consult the full warranty terms as well as information on extending the warranty period and details of our services at www.bresser.de/warranty_terms.
f=20 mm f=6 mm
The Moon
Orion Nebula (M 42)
Ring Nebula in Lyra constellation (M 57)
Dumbbell Nebula in the Vulpecula (Fox) constellation (M 27)
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HAS PURPOSE
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TO LEARN MORE, VISIT NATGEO.COM/INFO
© National Geographic Partners LLC. All rights reserved. NATIONAL GEOGRAPHIC
and Yellow Border Design are trademarks of National Geographic Society, used
under license.
Visit our website:
www.nationalgeographic.com
Bresser GmbH
Gutenbergstr. 2 · DE-46414 Rhede
www.bresser.de · info@bresser.de
Manual_9015000_Compact-Telescope_de-en-fr-nl-it-es-ru_NATGEO_v032022a
Errors and technical changes reserved.
References
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