Bedienungsanleitung Celestron EdgeHD 14 (Seite 7 von 21) (Englisch)

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Figure 2-3 -The emblem on

the end of the focus knob

shows the correct rotational

direction for focusing your

telescope

Focusing

Your telescope's focusing mechanism controls the primary mirror which is mounted on a ring

that slides back and forth on the primary baffle tube. The focusing knob, which moves the

primary mirror, is on the rear cell of the telescope just below the star diagonal and eyepiece.

Turn the focusing knob until the image is sharp. If the knob will not turn, it has reached the

end of its travel on the focusing mechanism. Turn the knob in the opposite direction until the

image is sharp. Once an image is in focus, turn the knob clockwise to focus on a closer object

and counterclockwise for a more distant object. A single turn of the focusing knob moves the

primary mirror only slightly. Therefore, it will take many turns (about 30) to go from close

focus to infinity.

For astronomical viewing, out of focus star images are very diffuse, making them difficult to

see. If you turn the focus knob too quickly, you can go right through focus without seeing the

image. To avoid this problem, your first astronomical target should be a bright object (like

the Moon or a planet) so that the image is visible even when out of focus. Critical focusing is

best accomplished when the focusing knob is turned in such a manner that the mirror moves

against the pull of gravity. In doing so, any mirror shift is minimized. For astronomical

observing, both visually and photographically, this is done by turning the focus knob

counterclockwise.

Mirror Support Clutches

The EdgeHD Optical tube is equipped with mirror tension

clutches to help support and minimize lateral movement of

the primary mirror during astrophotography.

To use the mirror clutches:

1. Use the focus knob to adjust the primary mirror

to the desired focus.

2. Once in focus, turn the two mirror lock knobs

clockwise until both are very tight and can be

turned no further.

Warning! Once the mirror is locked down, do not turn

the focuser knob without loosening the mirror locks first.

Although turning the focus knob should not damage the

telescope, undue stress can be placed on the focus mechanisms causing excessive image shift while focusing.

Calculating Magnification

You can change the power of your telescope just by changing the eyepiece (ocular). To determine the magnification of your

telescope, simply divide the focal length of the telescope by the focal length of the eyepiece used. In equation format, the

formula looks like this:

Focal Length of Telescope (mm)

Magnification =



Focal Length of Eyepiece (mm)

Let’s say, for example, you are using the 40mm Plossl eyepiece. To determine the magnification you simply divide the focal

length of your telescope (the C8 for example has a focal length of 2032mm) by the focal length of the eyepiece, 40mm.

Dividing 2032 by 40 yields a magnification of 51 power.

Mirror

Lock

Knobs

Figure 2-4 – Mirror Support Clutches

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