Notes On Cleaning; Troubleshooting; Warranty And Service - Bresser NATIONAL GEOGRAPHIC Operating Instructions Manual

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 pres-
sure 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 acclimatize for a short period of time, so
that the residual moisture can dissipate before storing.
Part III—Appendix
1. Possible Observation Targets
The following section details several interesting and easy-to-find
celestial objects you may want to observe through your telescope.
The pictures at the end of the manual show what the objects will look
like through your telescope's eyepiece.
The Moon (No. 23)
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 (M42) (No. 24)
Right Ascension: 05 35 (hours : minutes)
h m
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
(M42) is the brightest diffuse nebula in the sky. It is visible even with
the naked eye and is 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 (M57) (No. 25)
Right Ascension: 18 53 (hours : minutes)
h m
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 mag-
nificent 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 vis-
ible 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 (M27). When viewed
from Earth, we are looking directly at the pole of the nebula.
Constellation Vulpecula (Little Fox):
The Dumbbell Nebula (M27) (No. 26)
Right Ascension: 19 59 (hours : minutes)
h m
Declination: +22° 43' (degrees : minutes)
Distance: 1,360 light years from Earth
The Dumbbell Nebula (M27) was the first planetary nebula ever dis-
covered. 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 (M57). In reasonably
good weather, we can see this object well, even with low magnifica-
tion.

2. Troubleshooting

Problem: Solution:
No picture Remove dust protection cap
from the objective opening.
Blurred picture Adjust focus using the focus wheel.
No focus possible Wait for temperature to balance out.
Bad picture quality Never observe through a glass surface.
Object is visible Adjust viewfinder scope
in the viewfinder scope, (See Part I, Section 6).
but not through the telescope.
Despite using The diagonal mirror
diagonal mirror, should be vertical in
the picture is the eyepiece connection.
crooked.
DISPOSAL
Dispose of the packaging materials properly, accor-
ding to their type, such as paper or cardboard.
Contact your local waste-disposal service or envi-
ronmental 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 & SERVICE
The regular guarantee period is 2 years and begins on the day of
purchase. To benefit from an extended voluntary guarantee period as
stated on the gift box, registration on our website is required.
You can consult the full guarantee terms as well as information on
extending the guarantee period and details of our services at
www.bresser.de/warranty_terms.
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