Bresser TAURUS 90/900 NG Instrucciones De Uso página 12

6. Tracking and Observation Positioning
Tilt the telescope 90° using the declination axis (Fig. 15, C). Then turn the
telescope 180° to the right or left, until the objective lens points skyward.
Tighten the clamping screws on the two flexible shafts (Fig. 13, X and Y) so
that you can track stars using these flexible shafts. Manual use of the flexible
shaft along the right ascension axis (Fig. 15, D) compensates for the Earth's
rotation, so that objects always remain visible in the eyepiece.
If you want to track a different celestial object than the one you're currently
focused on, undo the clamping screws on the flexible shafts (Fig. 13, X and
Y), reposition the telescope, and then retighten the clamping screws. You
can then use the flexible shafts to do fine adjustments to the telescope's
position.
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HINT
The latitude of your observation site can be found in
maps or on the Internet. A good source of information is
www.heavens-above.com. After checking "anonymous
user" > "select" you may choose your country and city.
7. Viewfinder
The telescope is now roughly aligned and adjusted.
In order to obtain a comfortable observation position, you should loosen the
screws on the tube ring (Fig. 1, 8), so that you can rotate the telescope tube.
Bring the eyepiece and the viewfinder into a position that makes it comfort-
able for you to look through both.
Fine alignment is done using the viewfinder scope. Look through the view-
finder scope and centre Polaris (Fig. 16) in the middle of the crosshairs
(Fig. 17).
For fine adjustments, use the flexible shafts along the right ascension axis
(Fig. 15, D) and the declination axis (Fig. 15, E).
8. Observation
After you have located the pole star in the viewfinder scope, if you look
through the eyepiece, the pole star will be visible.
If necessary, you can use the flexible shafts to align the star more exactly,
just as you can adjust the image sharpness by using the focus wheel (Fig.
15, F).
Furthermore, you can now, by changing the eyepiece, increase the magnifi-
cation. Note that the magnification of the stars can hardly be seen.
HINT
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Eyepieces enlarge the picture of the telescope's prime
focus. The less the eyepiece's focal lengths is, the stron-
ger the magnification is. So various eyepieces are needed
to reach different magnifications. Begin every observation
with a low magnification (20 mm eyepiece), and increase
the magnification until you reach the desired picture size.
9. 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 the
season, date and time, their position in the heavens will change. The pole
star (Polaris) is the exception. It is a fixed star and the starting point for all
star maps.
When you first start observing, you should look at some well-known constel-
lations and star groups that are visible all year round. Remember that the
position of even constantly visible constellations shifts throughout the year.
If you have aligned your telescope accurately to observe one of these stars,
you will find that it vanishes from your field of view after a few minutes. To
even out this effect, you must turn the flexible handle (Fig. 15, D) along the
declination axis and your telescope will follow the trajectory of this star.
10. Accessories
Your telescope is supplied with a number of accessories as standard (Fig.
2). Depending on model this may include the following:
10.1. Eyepieces
Change eyepieces to change your telescope's magnification.
Formula for calculating magnification:
Focal length (Telescope) ÷ Focal length (Eyepiece) = Magnification
Examples:
Focal length Focal length
of telescope of eyepiece
900 mm 20 mm
900 mm 4 mm
10.2. Zenith mirror
The zenith mirror reverses (Fig. 2, 19) reverses the image (mirror image)
and is therefore used only for celestial observation.
10.3. Barlow lens
A Barlow increases magnification three times over.
10.3.1 Assembling and using refracting telescopes
If you use a refracting telescope the Barlow lens should only be inserted
in the zenith mirror (Fig. 9, 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.
10.4 Smartphone holder
Insert the eyepiece into the smartphone holder and tighten the screw (Fig.
19, X) to the bracket firmly. Then set the smartphone holder with the eye-
piece into the eyepiece connection (6) or the diagonal mirror (19) (refractor
telescopes) and tighten the clamping screws (Fig. 19, Y) by hand firmly.
Now start your smartphone camera app and press your smartphone on the
plate. Make sure that it is properly secured. The camera should rest just
above the eyepiece. Place the smartphone exactly over the eyepiece, so
that the image is exactly centered on your display. It may be necessary to
use the zoom function to fill out the whole screen of your smartphone. The
suction cups must be dry, clean and free from all kinds of dust and dirt.
We assume no responsibility for dropped and broken smartphones due to
incorrect handling.
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 tel-
escopes 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.
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NOTE!
The erecting lens is not recommended for astronomical
observations. Only use the diagonal mirror here. To obser-
ve landscapes, you may use the erecting lens.
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Magnification
Magnification
with 3x Barlow Lens
45X 135X
225X 675X