Bresser EQ Serie Bedienungsanleitung Seite 13

Your telescope has a so called equatorial mount. The main
attribute of this mount is that it has two perpendicular axes
which rotate to one another. (Fig 16, a+b).
The so-called right ascension axis (or RA or axis of sidereal
time on the meridian) (Fig. 16, b) must be aligned parallel to the
earth's polar axis (Fig. 26, c). The coordinates are found in e.g.
celestial charts and programs.
Manually operate the right ascension axis via the flexible shaft
(Fig. 1, 15) to constantly compensate for the earth's
rotation by turning it in the opposite direction.
As this axis must thus constantly be moved in a controlled
manner using the flexible shaft an electric tracking accessory
would be sensible (the necessary equipment for this is already
installed - sh. parts - assembly)
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. Balance:
To avoid demages from sensitive parts of the mount, the two
axes must now be balanced before observation.
I.e. the declination axis and the horary axis are correct, to make
working of the telescope easy and precise.
The horary axis is balanced by loosening the fixing screws (Fig.
16 I) and tilting the weight pole into a horizontal position. Now
adjust the counterweight (Fig. 16 H) on the pole, until the tube
and the weight remain in this horizontal position. Retighten the
fixing screw (Fig. 16 I) on the horary axis.
The declination axis is balanced by loosening the fixing screw
(Fig. 16 D) on the declination axis. Then loosen the screws on
the tube mounting (Fig. 16 A) and move the tube as long as it
remains in a horizontal position. Don't forget to retighten the fix-
ing screws again.
4. Adjustment:
To set the latitude axis (Fig. 16, F) (polar height) loosen the fixing
screw (Fig. 18, X) and adjust the polar height using the adjusting
screw (Fig. 18, Y).
The latitude scale has to be adjusted according the local latitude
(e.g. Munich 48°, Hamburg 53°)
Don't forget to tighten the fixing screw afterwards. Now set the
Declination axis (Fig. 16 C) to 90° by loosening and retightening
the screw (Fig. 16 D). The telescope tube is now pointing to the
celestial pole.
NOTE!
i The latitude of your observation site can be
found in maps or in the internet. A good source
of information is www.heavens-above.com. After
checking "anonymous user" > "select" you may
choose your land and city.
5. Polar alignment
Align the telescope with the barrel opening at the front to north.
To do this loosen the fastening screw (Fig. 19). You can then turn
the barrel until it faces exactly northwards. If necessary, use a
compass. Then tighten the fastening back up again.
Examine whether your telescope is mounted as shown in Fig.
28. The counterweight (Fig. 28 X) points to the floor and makes
together with the tube a vertical axis.
In this position Polaris is visible in the viewfinder; it is the
brightest star in the polar region (Fig. 27). If it is also be seen
in the field of view of the 20 mm eyepiece, polar alignment is
reached.
This alignment requires little patience but results in accurate
pointing.
The declination scale should now be set to "9" (90°). After doing
this, you can use the dec. and R.A. scale to find celestial objects
(also see part II – 13).
Once adjusted as above you can utilise the celestial object
search facility using the scales (see also 3.1. Feasible
Observation Objects).
6. Viewfinder scope
Your telescope is now roughly aligned and set.
To arrive at a comfortable observation position carefully undo the
main tube mounting screws (Fig. 9, X) until you can rotate the
telescope main tube. Move eyepiece and LED Viewfinder scope
until the position is comfortable for you.
Fine adjustment is done with the aid of the Viewfinder scope.
Look through the LED Viewfinder and try to align it with the polar
star (Fig. 27) with the help of the red dot (Fig. 15). In precisely
adjusting your telescope you will find the shaft (Fig. 16, K) of the
hour axis (Fig. 16, b) and that (Fig. 16, E) of the declination axis
(Fig. 16, a) helpful.
7. Observation
Once you have set the polar star in your LED Viewfinder scope
you will be able to view it through your telescope eyepiece.
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 (7).
Furthermore, you can now, by changing the eyepiece, increase
the magnification. Note that the magnification of the stars can
hardly be seen.
NOTE!
Eyepieces enlarge the (not directly visible) pic-
i
ture 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 magnifications. Begin every
observation with a low magnification (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.
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