Bedienungsanleitung Bresser 70-900 - National Geographic 90-71000 (Seite 14 von 40) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch, Polnisch)

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and the declination axis in that order, and position the telescope so that the

polar star appears in the center of the eyepiece's field of vision (No. 17).

Then retighten the polar vertical clamping screw and the declination axis.

Once you make this alignment, do not move or adjust the telescope, or it will

become misaligned. The telescope is now correctly aligned. This procedure

is essential so you can track celestial objects.

6. Tracking and Observation Positioning

Tilt the telescope 90° using the declination axis (No. 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 (No. 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 (No. 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 (No. 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.

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 (No. 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 (No. 16) in the middle of the crosshairs (No.

17).

For fine adjustments, use the flexible shafts along the right ascension axis

(No. 15, D) and the declination axis (No. 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 (No.

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

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 (No. 15, D) along the

declination axis and your telescope will follow the trajectory of this star.

10. Accessories

Your telescope comes with three eyepieces (No. 2, 18).

By interchanging the eyepieces, you can alter the magnification of your

telescope.

Formula for calculating magnification:

Focal length (Telescope) ÷ Focal length (Eyepiece) = Magnification

Examples:

Focal length

of telescope

Focal length

of eyepiece

Magniﬁ cation

with 1.5 erecting lens

900 mm 20 mm 45X 67X

900 mm 12 mm 75X 112X

900 mm 4 mm 225X 337X

The diagonal mirror (No. 2, 19) causes the image you view to be horizontally

reversed. You should use the diagonal mirror whenever making terrestrial

observations.

In order to see an upright and sidecorrect picture, you may use the erect-

ing lens. Loosen the screw (No. 8, X) and remove the diagonal mirror from

the eyepiece connection tube (No. 1, 6). Now put the erecting lens (No. 2,

20) in place and retighten the screw. Finally, put an eyepiece in place and

tighten the screw (No. 9, X).

11. Dismantling

After your interesting and successful observation, it is recommended that

you store the entire telescope in a dry, well-ventilated 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 barrel opening and the

eyepiece connection. Also, you should stow all the eyepieces and optical

accessories into their corresponding receptacles.

HINT

The erecting lens is not recommended for astronomical

observations. Only use the diagonal mirror here.

To observe landscapes, you may use the erecting lens.

Notes on Cleaning

Clean the eyepieces and lenses only with a soft, lint-free cloth, like a micro-

fibre cloth. To avoid scratching the lenses, use only gentle pressure 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

humidity, let the device acclimatize for a short period of time, so that the

residual moisture can dissipate before storing. Remove the dust protection

cap and store it in the included bag during use.

Bresser 70-900 - National Geographic 90-71000 Seite 14

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