Bresser messier R-80 Gebrauchsanleitung Seite 11

Insert the eyepiece with the greatest focal length in the star dia-
gonal mirror (13a). Point the telescope at a significant object
approximately 300 meters away (e.g. house gable, church tower
top, etc.) and adjust until it appears in the centre of the field of
vision (ill. 15, A).
Look through the finder scope and align it by turning the 6
adjustment screws until the object is visible in the middle of the
crosshairs. The image you previously saw through your
telescope lens must now be visible exactly in the centre of the
finder scope (2) crosshairs too (ill. 15,C).
Important: The finder scope has no integrated optical image
reversion. The image in the finder scope is upside down. This is
not a fault.
9. Protection-caps
In order to protect the inside of your telescope from dust and
filth, the tube opening is protected by a dust-protection-cap.
For observation remove the cap from the opening.
10. Flexible shafts
To ease precise adjustment of the declination and right
ascension axes flexible shafts are installed in the holding devices
of both axes provided for the purpose (illustration 14, X).
The long flexible shaft is mounted parallel to the telescope barrel
(illustration 1, 14). It is secured in place with a clamping screw in
the axis notch provided.
The short flexible shaft is 1, 15) is mounted laterally. It too is
secured in place with a clamping screw in the axis notch
provided.
Your telescope is now ready for use.
Part II – Handling
1. Telescope mount
The following points of information are important for positioning
and tracking accuracy of your telescope during night time
observation.
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) (illustration 16, b) must be aligned parallel to the
earth's polar axis (illustration 26, c). The coordinates are found
in e.g. celestial charts and programs.
Manually operate the right ascension axis via the flexible shaft
(illustration 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
fixing screws again.
4. Adjustment
To set the latitude axis (illustration 16, F) (polar height) loosen the
fixing screw (illustration 18, X) and adjust the polar height using
the adjusting screw (illustration 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.
HINT:
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 (illustration 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. If it is also be seen in the field
of view of the 25 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. Finder scope
Your telescope is now roughly aligned and set.
To arrive at a comfortable observation position carefully undo the
main tube mounting screws (ill. 9, X) until you can rotate the tele-
scope main tube. Move eyepiece and finder scope/LED finder
scope until the position is comfortable for you.
Fine adjustment is done with the aid of the finder scope. Look
through the finder scope and try to align it with the polar star (ill.
27) in the centre of the crosshairs (ill. 31). In precisely adjusting
your telescope you will find the shaft (ill. 16, K) of the hour axis
(ill. 16, b) and that (ill. 16, E) of the declination axis (ill. 16, a) hel-
pful.
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GB