Notes On Cleaning - Bresser 88-43202 National Geographic Gebrauchsanleitung

Part II – Handling
1. Mount
Your telescope is equipped with an azimuth mount that is easy to use.
You can adjust your telescope horizontally and vertically with it.
2. Setup
A dark place is essential for observations because light of all kinds (e.g.
street lamps) disturb the visible details of the sky. If you leave a bright
room at night, your eyes need approximately 20 minutes to reach full
night adaptation. After this time, your observations can be started.
Don't observe from enclosed areas and put your telescope in location,
with the accessories, 30 mins before beginning observation, in order to
guarantee a temperature balance.
You should also make sure that the telescope is placed on a stable and
even ground.
3. Vertical and horizontal adjustment
3.1. Vertical adjustment
Undo the fastening screw (Fig. 14a, X) and move the tube up or down.
Once you find the right setting turn the fastening screw hand tight.
This makes the adjustment a fixed one.
Minor changes can be carried out by slight turns of the adjustment
wheel (Fig. 14b, Y). Before re-adjusting undo the fastening screw (Fig.
14a, X).
3.2. Horizontal adjustment
To move the telescope horizontally undo the fastening screw (Fig. 16,
Z) and turn the device in the desired direction.
Once you've reached the desired position retighten the fastening screw
hand tight
4. Observation
Aim the telescope at the object to be observed. Look through the LED
finder scope and centre the object in the middle of the viewing field (red
dot) by horizontally and vertically adjusting the telescope.
If you now look through the lens you will see the magnified object.
Turn the focussing wheel to get it into sharp focus if necessary.
You can also change the lens to achieve greater magnification.
i
HINT:
Start each observation with a low-power lens
(20 mm).
5. Finding stars
You will initially have problems orienting yourself in the sky as stars
and constellations are in constant movement and change their position
depending on the season, date and time.
The polar star is the sole exception. It is a fixed star and the starting point
of all stellar maps.
You can see some well-known stars and constellations on the map
that are visible throughout the year. The arrangement of the stars is
dependent on the date and the time, however.
6. Accessories
Your telescope is supplied with a number of accessories as standard
(Fig. 2). Depending on model this may include the following.
6.1. Eyepieces
Change eyepieces to change your telescope's magnification.
Formula for calculating magnification:
Focal length of the telescope : focal length of the eyepiece
= magnification
Examples
700 mm: 20 mm =
700 mm: 12.5 mm =
700 mm: 4 mm =
35 x
56 x
175 x
6.2. Zenith mirror (refraction telescope only)
The zenith mirror reverses (19) reverses the image (mirror image) and is
therefore used only for celestial observation.
6.3. Erecting lens
To see a vertical image the right way up an erecting lens (20) may be
used.
Undo the clamping screw (Fig. 22, X) and remove all accessories from
the eyepiece supports (6). Then insert the inversion lens (20) straight
in the eyepiece supports and hand tighten the clamping screws. Then
insert the eyepiece (e.g. f=20 mm) in the inversion lens opening and
tighten the clamping screw (Fig. 22, Y).
6.4. Barlow lens
A Barlow lens (21) increases magnification two times over.
6.4.1 Assembling and using refracting telescopes
If you use a refracting telescope the Barlow lens should only be inserted
in the zenith mirror (Fig. 12a, X). Remove the eyepiece from the zenith
mirror and replace it with the Barlow lens. Then first insert the eyepiece
with the greatest focal length and then hand tighten the clamping screw
to affix it in place (Fig. 21, Z).
6.4.2 Assembling and using reflecting telescopes
If you use a reflecting telescope please undo the clamping screw on
the eyepiece supports (Fig. 21, X) and remove the eyepiece from those
supports. Then insert the Barlow lens straight in the supports and hand
tighten the clamping screw. Finally first insert the eyepiece with the
greatest focal length in the Barlow lens and then fasten it in place with
the clamping screw (Fig. 21, Z).
7. Dismantling
After a hopefully interesting and successful observation, it is
recommended that you store the entire telescope in a dry, well
aired area. On some telescopes the tripod and mount can easily be
separated. The adjustments to the mount will remain intact.
Don't forget to put the dust-protection-caps onto the tube
opening and onto the eyepiece connection. Also, you should stow all
the eyepieces and optical accessories into their corresponding recep-
tacles.
i
HINT:
The erecting lens is not recommended for astronomical
observations. Only use the diagonal mirror here. To
observe landscapes, you may use the erecting lens.

NOTES on cleaning

Clean the lenses (eyepiece and/or lens) with a soft and lint-free cloth
only (e.g. microfibre). Do not apply excess pressure to the cloth so as
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 - in particular in
situations of high humidity - let the device acclimatize for a short period
of time, so that the residual moisture can dissipate. Remove the dust
cover and store it in the included bag.
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