Bedienungsanleitung Celestron CGEM DX (Seite 15 von 38) (Englisch)

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Negative is the amount of compensation applied when you

release the button, winding the motors back in the other

direction to resume tracking.

Normally both values should be the same. You will need to

experimentwithdifferentvalues(from0-99);avaluebetween

20 and 50 is usually best for most visual observing, whereas a

higher value may be necessary for photographic guiding.

To set the anti-backlash value, scroll down to the anti-backlash

option and press ENTER. While viewing an object in the

eyepiece, observe the responsiveness of each of the four arrow

buttons. Note which directions you see a pause in the star

movement after the button has been pressed. Working one axis

at a time, adjust the backlash settings high enough to cause

immediate movement without resulting in a pronounced jump

when pressing or releasing the button. Now, enter the same

values for both positive and negative directions. If you notice

a jump when releasing the button, but setting the values lower

results in a pause when pressing the button, go with the higher

value for positive, but use a lower value for negative. The

telescope will remember these values and use them each time

it is turned on until they are changed.

FilterLimits— When an alignment is complete, the telescope

automatically knows which celestial objects are above the

horizon. As a result, when scrolling through the database

lists (or selecting the Tour function), the hand control will

display only those objects that are known to be above the

horizon when you are observing. You can customize the object

database by selecting altitude limits that are appropriate for

your location and situation. For example, if you are observing

from a mountainous location where the horizon is partially

obscured, you can set your minimum altitude limit to read

+20º. This will make sure that the hand control only displays

objects that are higher in altitude than 20º.

If you want to explore the entire object database, set the

maximum altitude limit to 90º and the minimum limit to

–90º. This will display every object in the database lists

regardless of whether it is visible in the sky from your

location.

Direction Buttons — The direction a star appears to

move in the eyepiece changes depending on which side

of the Meridian the telescope tube is on. This can create

confusion especially when guiding on a star when doing

astrophotography. To compensate for this, the direction of

the drive control keys can be changed. To reverse the button

logic of the hand control, press the MENU button and select

Direction Buttons

from the Utilities menu. Use the Up/Down

arrow keys (10) to select either the azimuth (right ascension) or

altitude (declination) button direction and press ENTER. Select

either positive or negative for both axes and press ENTER to

save. Setting the azimuth button direction to positive will move

the telescope in the same direction that the telescope tracks

(i.e. towards the west). Setting the altitude buttons to positive

will move the telescope counterclockwise along the DEC axis.

Goto Approach — lets the user deﬁne the direction that the

telescope will approach when slewing to an object. This allows

the user the ability to minimize the effects of backlash when

slewing from object to object. Just like with Direction Buttons,

setting GoTo Approach to positive will make the telescope

approach an object from the same direction as tracking (west)

for azimuth and counterclockwise in declination. Declination

Goto approach will only apply while the telescope tube is on

one side of the Meridian. Once the tube passes over to the

other side of the Meridian, the Goto approach will need to

be reversed.

To change the Goto approach direction, simply choose Goto

Approach from the Scope Setup menu, select either Altitude or

Azimuth approach, choose positive or negative and

press ENTER.

In order to minimize the affect of gear backlash on

pointing accuracy, the settings for Button Direction

should ideally match the settings for GoTo Approach. By

default, using the up and right direction buttons to center

alignment stars will automatically eliminate much of the

backlash in the gears. If you change the Goto approach

of your telescope it is not necessary to change the Button

Direction as well. Simply take notice of the direction the

telescope moves when completing its ﬁnal goto approach.

If the telescope approaches its alignment star from the

west (negative azimuth) and clockwise (negative altitude)

then make sure that the buttons used to center the

alignment stars also move the telescope in the

same directions.

Autoguide Rate — Allows the user to set an autoguide rate

as a percentage of sidereal rate. This is helpful when

calibrating your telescope to a CCD autoguider for long

exposure photography.

SCOPE SETUP

SET UP TIME -SITE

ANTI-BACKLASH

FILTER LIMITS

DIRECTION BUTTONS

GOTO APPROACH

AUTOGUIDE RATES

OTA ORIENTATION

MERIDIAN

MOUNT SETTINGS

RA POSITIVE

RA NEGATIVE

DEC POSITIVE

DEC NEGATIVE

RA BUTTONS

DEC BUTTONS

RA LIMITS

RA APPROACH

DEC APPROACH

RA RATE

DEC RATE

NORMAL

EAST

WEST

FAVOR CURRENT

FAVOR WEST

FAVOR EAST

DISABLED

CONE VALUE

DEC INDEX

RA INDEX

Celestron CGEM DX Seite 15

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