Bresser messier R-80 Gebrauchsanleitung Seite 12

7. Observation
Once you have set the polar star in your finder scope/LED finder
scope you will be able to view it through your telescope eyepie-
ce.
If necessary, you can with help of the flexible handles align the
star more exactly, just as you can adjust the definition by using
the focussing wheel (Fig. 16 B).
Furthermore, you can now, by changing the eyepiece, increase
the magnification. Note that the magnification of the stars can
hardly be seen.
HINT:
Eyepieces enlarge the (not directly visible) picture of
the telescope's prime focus. The less the eyepiece's
focal lengths is, the stronger is the magnification. So
various eyepieces are needed to reach different magni-
fications. Begin every observation with a low magnifi-
cation (20mm eyepiece).
8. Find a star
Initially it will be difficult for you to find your bearings in the
firmament, since the stars and the constellations are always
moving and according to season, date and time their position in
the heavens will change. The pole star is the exception. It is a
fixed star and the starting point for all star maps.
At the beginning, you should look at some well known
constellations and star groups order that are visible the whole
year over. The position of the heavenly bodies is however
dependent on date and time.
If you have aligned your telescope accurately on one of these
stars, you will find that it has vanished your visual field after a
few minutes. To even out this effect, you must turn the
flexible handle (Fig. 16 K) the horary axis and your telescope will
follow the trajectory of this star.
9. Part circles
Stars and other heavenly bodies are positioned in the heavens
by coordinates. The place of a star is fixed in the universe by the
rectascension (horary) and by the declination.
Declintion (Fig. 16 C) is the spacing of a heavenly body from the
Heaven's equator, in angle degrees. To the north of the equator,
the degree number is positive. If the star is to the south of the
equator, the degree number is negative.
Rectascension (Fig. 16 M) a measured distance of a star from
the heavens equator in sidereal (star) time. The vernal equinox is
the point where the ecliptic meets the equator (Fig. 26 e) at the
beginning of spring. The value of the daily heavenly revolutions is
counted in the tempo of a 24 hour clock.
For more accurate information look at your star maps and
corresponding compartment-literature (special-accessories).
10. Accessories
Your telescope is supplied with a number of accessories as stan-
dard (ill. 2). Depending on model this may include the following.
10.1. Eyepiece
Change eyepieces to change your telescope's magnification.
Formula for calculating magnification:
Focal length of the telescope : focal length of the eyepiece =
magnification
900 mm: 25 mm =
10.2. Zenith mirror (refraction telescope only)
The zenith mirror reverses (ill. 2,19) reverses the image (mirror
image) and is therefore used only for celestial observation.
10.3. Inversion lens (Optional accessory)
To see a vertical image the right way up an inversion lens may be
used.
33 x
Undo the clamping screw (ill. 25, X) and remove all accessories
from the eyepiece supports (ill. 1, 6). Then insert the inversion
lens (optional accessory) straight in the eyepiece supports and
hand tighten the clamping screws. Then insert the eyepiece in
the inversion lens opening and tighten the clamping screw.
10.4. Barlow lens (optional accessory)
A Barlow lens increases magnification three times over.
10.4.1 Assembling and using the Barlow lens
The Barlow lens should only be inserted in the zenith mirror.
Remove the eyepiece from the zenith mirror and replace it with
the Barlow lens. Then first insert the eyepiece and then hand
tighten the clamping screw to affix it in place (fig. 12 X).
11. 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 receptacles.
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.
12. Care
Your telescope is a high-quality optical appliance. Therefore you
should avoid your telescope coming into contact with dust or
moisture. Avoid putting fingerprints on the lens.
If dirt or dust have nevertheless accumulated on your telescope,
you should first remove it with a soft brush. Then clean the
soiled area with a soft, lint-free cloth.
The best way to remove fingerprints from the optical surfaces is
with a lint free, soft cloth, which you have previously treated with
some alcohol. Even better is the use of compressed air from a
can.
If your telescope has collected dust or moisture internally, do not
try to clean it yourself but return it directly to your local
specialist.
Don't clean the telescope's optics too often. Doing this, may
result in damaged coatings. If you telescope should have
become dusty from the inside, don't attempt to clean it on your
own but consult your local dealer or Lidl centre of your country
(find a list of Lidl centres in this manual).
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