Bedienungsanleitung Bresser MCX Goto Serie (Seite 13 von 40) (Englisch)

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Basic knowledge

Basic hints

With the MCX telescopes you can start observing immediately after unpacking. However,

if you have first familiarized yourself with the basics of using the telescope, a subsequent

observation will be much easier and more rewarding.

Eyepiece selection

The task of a telescope eyepiece is to magnify the image produced by the telescope's

main optics. Each eyepiece has a specific focal length, which is specified in millimeters

(mm). The smaller the focal length, the greater the magnification. Low magnification

eyepieces offer a large field of view, bright and high-contrast images and relax your eyes

during longer observation sessions. To adjust an object with the telescope, it is best to

useaslightlymagnifyingeyepiece-suchastheSP26mmeyepiecesuppliedwiththe

MCX. Only when the desired object is set and centered in the center of the field of view

should you switch to an eyepiece with a larger magnification in order to enlarge the image

as far as the current atmospheric conditions allow.

For terrestrial observation we recommend eyepieces with weaker magnification. Dunst,

warm air streaks and suspended particles in the air distort the images when higher

magnifications are used.

For astronomical observations, low or high magnifications may be useful, depending on

the object of observation. Eyepieces with smaller magnifications are used for large-area

observations. On the other hand, high magnifications when observing details on the moon

(e.g. craters) can provide very beautiful images. Even for planets, high magnifications

with good visibility bring the best results.

NOTE!

Seeing conditions change significantly from night to night. Air turbulence, which also

occurs on apparently clear nights, can distort the images permanently. If an image

appears blurry and poorly defined, step back to a lower magnifying eyepiece to achieve a

betterresolution(seefigure).26)

What is "magnification"?

The magnification at which a telescope works is determined by two factors: The focal

length of the telescope and the focal length of the eyepiece currently in use.

The focal length of a telescope determines the magnification. Lens telescopes are usually

as long as the focal length. With the mirror-lens combination of an MCX model, however,

this focal length is ultimately extended by the telescope's secondary mirror so that a long

effective focal length can be accommodated in the MCX's short telescope tube. The focal

lengthoftheMCX-127,forexample,is1900mm.Ifyouhadaclassicrefractorinfront

ofyou,itwouldmeanthatitsopticaltubewouldhavetobemorethan1.9mlong-thus

considerablylongerthanthehandyMCXtubelengthofalmost40cmwiththeMCX-127!

The eyepiece focal length stands for the distance the light travels in the eyepiece until

it reaches the focal point. The focal length of the eyepiece is usually indicated on the

sideoftheeyepiece.TheSuperPlössl(SP)26mmeyepiecesuppliedwiththeMCXhas

afocallengthof26mm.Theterm"SuperPlössl"herestandsfortheopticaldesignofthe

eyepiece, a design specially designed for high-performance telescopes that provides a

large, comfortable field of view combined with extremely high image resolution.

Calculation of the magnification: A telescope uses different eyepiece focal lengths to

achievedifferentmagnifications.TheSP26mmeyepiece,whichispartofthestandard

equipment, produces a 73x magnification (73x) with the MCX-127, for example. If you

equip yourself with additional eyepieces from the range of accessories, you will get a

wide variety of magnification options. In addition, you can double the magnification of

theeyepiecesusedwitha2xBarlowlens(seealso"Optionalaccessories"onpage36).

To calculate the magnification you can achieve with a given eyepiece, use the following

formula:

Telescope focal length

Fig.Fig. 26 26

Example for a too high magnification

(Saturn).

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