Bedienungsanleitung Bresser 90-70000 National Geographic (Seite 15 von 48) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch, Polnisch)

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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 (No. 9, X) until you can rotate the tel-

escope's main tube. Move the 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 North Star (No.

27) in the centre of the crosshairs (No. 31). In precisely adjusting

your telescope, you will find the shaft (No. 16, K) of the right ascen-

sion axis (No. 16, b) and that (No. 16, E) of the declination axis (No.

16, a) helpful.

7. Observation

Once you have found the North Star with your finder scope/LED

finder scope, you will be able to view it through your telescope eye-

piece.

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

focusing wheel (No. 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 picture of the telescope's

prime focus. The less the eyepiece's focal lengths

is, the stronger the magnification is.

Various eyepieces are needed to reach different

magnifications. Begin every observation with a

low-powered magnification (20 mm eyepiece).

8. Find a Star:

Initially, it may be difficult for you to find your bearings in the sky,

since the stars and constellations are constantly moving, and

according to season, date and time, their positions in the sky will

change. The North Star is the exception. It is a fixed star and the

starting point for all star maps.

When you first begin to observe the night sky, look at some well-

known constellations and star groups that are visible year-round.

This will help you to orient yourself and learn the functions of your

telescope.

If you have aligned your telescope accurately on one of these stars,

you will find that it vanishes from your visual field after a few minutes

due to the Earth's rotation. To even out this effect, you must turn the

flexible handle (No. 16, K) of the right ascension axis, and your tel-

escope will follow the trajectory of this star.

9. Part circles:

Stars and other celestial bodies are positioned in the sky by coordi-

nates. The place of a star is fixed in the universe by its right ascen-

sion and declination coordinates, similar to latitude and longitude on

Earth.

Declintion (No. 16, C) is the spacing of a celestial body from the

sky's equator, in angle degrees. To the north of the equator, the

degree number is positive. To the south of the equator, the degree

number is negative.

Right ascension (No. 16, M) is the measured distance of a star from

the sky's equator in sidereal (star) time. The vernal equinox is the

point where the ecliptic meets the equator (No. 26, e) at the begin-

ning of spring. The value of the daily celestial revolutions is counted

in the tempo of a 24-hour clock.

For more accurate information about this topic, consult star maps

and other literature, or the Internet.

10. Accessories

Your telescope is supplied with a number of accessories (No. 2).

Depending on your telescope's model, these accessories may

include the following:

10.1. Eyepieces

Change eyepieces to change your telescope's magnification.

700 mm ÷ 20 mm = 35X

700 mm ÷ 12.5 mm = 56X

700 mm ÷ 4 mm = 175X

Formula for calculating magnification:

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

Examples:

10.2. Zenith mirror (refraction telescope only)

The zenith mirror (No. 2, 19) reverses the image you see, 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.

Loosen the clamping screws (No. 25, X) and remove all accesso-

ries from the eyepiece supports (No. 1, 6). Insert the inversion lens

(No. 2, 20) straight into the eyepiece supports and hand tighten the

clamping screws. Then insert the eyepiece (e.g. f=20 mm) into the

inversion lens opening and tighten the clamping screws (No. 25, Y).

10.4. Barlow lens

A Barlow lens increases magnification by a factor of three.

10.4.1 Assembling and using with refracting telescopes

If you use a refracting telescope, the Barlow lens should only be

inserted into the zenith mirror (No. 13a, X). Remove the eyepiece

from the zenith mirror and replace it with the Barlow lens. Then insert

the eyepiece with the greatest focal length and hand tighten the

clamping screws to affix it in place (No. 24).

10.4.2 Assembling and using with reflecting telescopes

If you use a reflecting telescope, loosen the clamping screws on the

eyepiece supports (No. 13b, X), and remove the eyepiece from those

supports. Then insert the Barlow lens straight into the supports and

hand tighten the clamping screws. Finally, insert the eyepiece with

the greatest focal length into the Barlow lens, and then fasten it in

place with the clamping screws (No. 24).

11. Dismantling:

After an 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 before storing. Also, you

should stow all eyepieces and optical accessories in their

corresponding receptacles.

NOTE

The erecting lens is not recommended for ast-

ronomical observations. Only use the diagonal

mirror for astronomical observations. Use the

erecting lens to observe landscapes.

Notes on Cleaning

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

a microfibre 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.

Bresser 90-70000 National Geographic Seite 15

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