- 8 -
This should then also be visible in the centre of the field of view of the eyepi-
ece (f=20 mm). Polar alignment has been achieved. This setup requires some
patience, but rewards you with a good positioning option when searching with
celestial coordinates.
In this polar alignment, the graduated circles (scales) of the declination axis
(Fig 28) should be at "9" (= 90°) and the right ascension axis (Fig 29) at "0" (= 0
hours). If necessary, carefully rotate both scales to the appropriate values (alig-
ned with the arrows in each case).
Thus set, you can use the finding of celestial objects with the help of the gradua-
ted circles (scales) (see also 3.1. Possible objects of observation).
6. Fine alignment by means of LED viewfinder
Your telescope is now roughly aligned and adjusted.
To achieve a comfortable observation position, carefully loosen the screws of the
tube holder (Fig 9, X) so that you can rotate the telescope tube. Move the eyepie-
ce and LED viewfinder to a position from which you can observe comfortably.
The fine alignment is done by using the finder scope. Look through the viewfin-
der and try to align the polar star (Fig 26) with the illuminated point (Fig 14). The
shaft (Fig15, K) of the hour axis (Fig15, b), as well as the shaft (Fig15, E) of the
declination axis (Fig15, a) will help you with the exact setting.
7. First observations
Remove the caps from the openings for observation.
After you have adjusted the polar star in the LED viewfinder, you will be able to
see the polar star in the telescope when you now look through the eyepiece.
If necessary, you can now align the star more precisely with the aid of the
flexible shafts and adjust the focus using the focus wheel (7).
Furthermore, you can now set a higher magnification by changing the eyepiece
(smaller focal length). Please note that the magnification of the stars is hardly or
not at all perceptible.
TIP:
Eyepieces are lens systems that face the eye. With the eyepiece,
the image formed at the focal point of the telescope lens is recor-
ded, i.e. made visible, and magnified again. You need eyepieces
with different focal lengths to achieve different magnifications.
Start each observation with a low magnification eyepiece (= higher
focal length of 20mm).
i
8. Star search
At first, you will certainly find it difficult to orientate yourself in the starry sky, as
stars and constellations are always in motion and change their position in the
sky depending on the season, date and time.
The exception is the polar star. Through it runs the extended imaginary polar
axis of the earth. It is a fixed star and the starting point of all star charts. On the
drawing you can see some well-known constellations and star arrangements that
are visible all year round. However, the arrangement of the stars depends on the
date and time.
If you point your telescope at one of these stars, you will notice that it disap-
pears from the field of view of your eyepiece after a short time. To compensate
for this effect, operate the flexible shaft (Fig15, K) of the right ascension axis and
your telescope will follow the apparent trajectory of this star.
9. Setting circles
Stars and other heavenly bodies are positioned in the heavens by coordinates. A
star's place in the universe is determined by its right ascension and declination.
Declination (Fig 22, C) is the distance of a star from the celestial equator (Fig
25, d), measured in angular degrees. For stars north of the celestial equator,
the degree becomes positive. If the star is south of the equator, the degree is
marked with a minus sign.
Right ascension (Fig 22, J) is a distance of a star from the vernal equinox measured
on the celestial equator. The vernal equinox is the point of intersection of the
celestial equator with the apparent orbit of the sun (the so called Ecliptic) (Fig 25,
e). This happens in spring at the equinox (end of March). The value is counted in
time from 0 to 24 o'clock, contrary to the daily celestial revolution.
You can find more detailed information in star charts or the relevant specialist
literature.
10. Accessories
Several accessories (Fig 2) are supplied with your telescope as standard.
Important:
When fitting accessories, ensure that the small clamping screws (Fig
12, X) for fixing are always hand-tightened.
10.1. Eyepieces
By changing the eyepieces, you determine the respective magnification of your
telescope.
Calculation of the magnification:
Focal length (telescope) ÷ Focal length (eyepiece) = Magnification
Examples:
Telescope-
Focal length
Eyepiece
Focal length
Magnification Magnification
with 3x Barlow lens
900 mm
20 mm
45X
135X
900 mm
12 mm
75X
225X
900 mm
4 mm
225X
675X
10.2. Diagonal mirror
When looking through the eyepiece, an upside-down image appears for tech-
nical reasons. The zenith mirror causes an image inversion and is therefore
especially suitable for earth observation. But it is also very helpful for easier
orientation in the starry sky.
10.3. Barlow Lenses
With a 3x Barlow lens, you can achieve an additional increase in magnification
of 3x.
If necessary, the Barlow lens (Fig 23, 20) is inserted between the upright prism
(Fig 23, 19) and the eyepiece (Fig 23, 18).
Note:
Not every mathematically possible enlargement (sh. Table to 10.1) is also
absolutely sensible. Some objects - especially in the night sky - can only be
seen blurred at higher magnifications. This is not a defect, but a technical
or physical one.
11. Dismantling
After a hopefully interesting and successful observation it is recommended to
store the entire telescope in a dry and well ventilated room. Some telescope
models allow you to separate the mount and tripod by simply unscrewing them.
In this case, your settings on the mount are retained. Do not forget to put the
dust-protection-caps on to the OTA opening and on to the eyepiece connection.
Also, you should stow all the eyepieces and optical accessories into their corres-
ponding containers.
12. Cleaning & Storage
Clean the lenses (eyepieces and/or objective lenses) only with a soft and lint-free
cloth (e.g. microfibre cloth). To avoid scratching the lenses, use only gentle pres-
sure with the cleaning cloth.
To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-
cleaning solution and wipe the lenses gently.
Protect the device from dust and moisture! After use, particularly in high humi-
dity, let the device acclimatise at room temperature for a short period of time, so
that the residual moisture can dissipate.
PART III - Annex
1. Possible observation objects
Below we have selected and explained some very interesting celestial bodies and
star clusters. In the accompanying illustrations at the end of the manual you can
see how you will see the objects through your telescope with the supplied eyepi-
eces - in good viewing conditions:
Moon (Fig 30)
The moon is the only natural satellite of the earth
Orbit:
approx. 384,400 km from the earth
Diametre: 3.476 km
Distance: 384.401 km
