Handleiding Bresser 4701102 (pagina 15 van 40) (Engels)

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-15-

Telescope mounts

The technical aids which ensure that the optical tube of a telescope can be moved in

differentdirectionsaresummarisedundertheterm"telescopemount"or"mount".These

telescopic mountings can be divided into two basic designs:

Azimuth mounts allow the telescope tube to move vertically and horizontally. The MCX

has an azimuthal mount (fig. 27). In this azimuthal configuration, the telescope is ideally

suited for all terrestrial applications and for occasional astronomical observations. For

this purpose, you may place the telescope on a fixed table top without further ado. Of

course, the field tripod supplied as standard is recommended as a safe, height-adjustable,

azimuthal observation foundation. To adjust and manually track various objects - whether

terrestrial or astronomical - with the telescope mounted in the azimuthal configuration,

theobserversimplypressesthearrowkeysofthehandheldcomputer(5,fig.25;page

34).

Automatic tracking in both axes is only possible after successful 1-star, 2-star or 3-star

alignment(seepages24and25).

Equatorial (parallactic) mounts are exceptionally advantageous when a telescope is to

be used for extensive astronomical applications, as the celestial objects move neither

horizontally nor vertically, but follow a combination of these two directions of motion.

Ifyouuseoneofthemechanicaltelescopicaxles(seeFig.28)tiltsuntilitpointstothe

celestial pole (i.e. by aligning this telescope axis with the polar star), astronomical objects

can be tracked by moving only this axis of the telescope. With the azimuthal mount, both

axes must be moved simultaneously instead. An equatorial mount in which one of its

axes(theso-calledpolaraxis)pointstothecelestialpoleiscalled"alignedwiththepole".

You can align the MCX to the terminal. Use the supplied field tripod with pole height

cradle.

OnceyouhavealignedtheMCXwiththepole,followtheinstructionsonpage19(Aligning

the MCX with the Sky Pole). This enables you to track celestial objects particularly evenly.

In this configuration, the observer no longer has to press the arrow keys of the handheld

computer to track the celestial objects. Independent of the automatic tracking, the arrow

keys of the Autostar are very helpful in this configuration when it comes to centering

objects in the center of the telescope's field of view, or if you want to wander over the

lunar surface with the telescope, for example, or wander through a larger star field.

The handheld: The handheld computer allows you to operate your MCX with either the

azimuthal or equatorial mount. The azimuthal mount is superior to the equatorial mount in

terms of stiffness and stability, but has the disadvantage that the tracking of astronomical

objects is less accurate. The handheld computer of the MCX compensates for this as

far as possible with computer-controlled tracking - this combines the advantages of

both mounting types, but avoids the disadvantages! In astrophotography, however, the

equatorial mount should be preferred due to the rotation of the image field. In addition, the

handheld computer has the option of automatically approaching astronomical objects.

Terrestrial Observations

The high-resolution MCX is both an astronomical and a terrestrial telescope. If you use

the telescope as shown in Fig. 27, then you can use it for an extremely comprehensive

range of observations. Never forget, however, that the terrestrial images may be upright,

but are displayed in reverse as soon as you look through the eyepiece. Normally this

image orientation is not too annoying, unless you want to read a remote license plate or

similar.

The observation of terrestrial objects requires a viewing direction along the earth's

surface through heat streaks. These heat streaks often cause serious losses in image

quality.Lowmagnificationeyepieces,suchastheSP26mmeyepiece,enhancetheeffect

of these streaks less than eyepieces with higher magnifications. For this reason, weaker

magnifying eyepieces provide a smoother image with higher image quality. If the image

appears blurry or poorly defined, downgrade to a lower magnification where the heat

streaks will not have such a devastating effect on the image quality. Observation during

the early morning hours, before a heat accumulation has formed on the ground, usually

offers better visibility conditions than during the late afternoon hours.

Basic knowledge

Fig. 27

Fig. 28

The azimuthal mount moves the telescope

vertically and horizontally.

(1 = Azimuth; 2 = Height (Elevation))

The equatorial mount is aligned with the

celestial pole. (1 = right ascension; 2 =

declination; 3 = polar star)

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