Bresser Pollux 150/1400 EQ3 Mode D'emploi page 14

Look through the finder scope and align it by turning the 3 or
6 adjustment screws until the object is visible in the middle of
the crosshairs. The image you previously saw through your tele-
scope lens must now be visible exactly in the centre of the finder
scope (2) crosshairs too (ill. 15,C).
Important. Some finder scopes have no integrated optical image
reversion. The image in the finder scope is then upside down.
This is not a fault.
NOTE!
Some finder scopes have no integrated optical
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image reversion. The image in the finder scope is
then upside down. This is not a fault.
8.2 Alignment, types II + III (LED finder scopes)
The LED finder scope must be adjusted before use. This means
that the LED finder scope and the telescope tube must be ali-
gned in parallel.
Insert the eyepiece with the greatest focal length in the zenith
mirror (fig. 13a, refracting telescopes only) or directly in the
eyepiece supports (fig. 13b, reflecting telescopes only). 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).
Then turn the LED finder scope (fig. 1, 2) on using the On/Off
switch (fig. 1b, Z). Select setting „2" in daylight, setting „1" for
nighttime.
Look through the LED finder scope and align it by turning the
horizontal (fig. 1b, X) and vertical (fig. 1b, Y) adjustment screws
until you see the red dot in the centre of the image (ill. 15, C).
Finder scope and telescope are now adjusted to one another.
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.
NOTE!
The latitude of your observation site can be
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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 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).
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