Bresser Pollux 150/1400 EQ3 Mode D'emploi page 15

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)
helpful.
7. Observation
Once you have set the polar star in your finder scope/LED finder
scope you will be able to view it through your telescope eyepi-
ece.
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 (Fig. 16 B).
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.
Rectascension (Fig. 16 M) a measured distance of a star from
the heavens equator in sidereal (star) time. The vernal equinox is
the point where the ecliptic meets the equator (Fig. 26 e) at the
beginning of spring. The value of the daily heavenly revolutions is
counted in the tempo of a 24 hour clock.
For more accurate information look at your star maps and
corresponding compartment-literature (special-accessories).
10. Accessories
Your telescope is supplied with a number of accessories as stan-
dard (ill. 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 of the telescope : focal length of the eyepiece =
magnification
Examples
700 mm: 25 mm
700 mm: 9 mm
700 mm: 4 mm
10.2. Zenith mirror (refraction telescope only)
The zenith mirror reverses (ill. 2,19) reverses the image (mirror
image) and is therefore used only for celestial observation.
10.3. Inversion lens
To see a vertical image the right way up an inversion lens may
be used.
Undo the clamping screw (ill. 25, X) and remove all accessories
from the eyepiece supports (ill. 1, 6). Then insert the inversion
lens (ill. 2, 20) straight in the eyepiece supports and hand tighten
the clamping screws. Then insert the eyepiece (e.g. f=20 mm) in
the inversion lens opening and tighten the clamping screw (ill.
25, Y).
10.4. Barlow lens
A Barlow increases magnification three times over.
10.4.1 Assembling and using refracting telescopes
If you use a refracting telescope the Barlow lens should only be
inserted in the zenith mirror (fig. 13a, 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 (fig. 24).
10.4.2 Assembling and using reflecting telescopes
If you use a reflecting telescope please undo the clamping screw
on the eyepiece supports (fig. 13b, X) and remove the eyepiece
from those supports. Then insert the Barlow lens straight in the
supports and hand tighten the clamping screw. Finally first insert
the eyepiece with the greatest focal length in the Barlow lens
and then fasten it in place with the clamping screw (fig. 24).
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 telescopes 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.
NOTE!
i
The erecting lens is not recommended for ast-
ronomical observations. Only use the diagonal
mirror here. To observe landscapes, you may use
the erecting lens.
- 15 -
= 28 x
= 78 x
= 175 x
GB