Celestron CGE1400 Manual suplementar - Página 12

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Anti-backlash

play is evident by how long it takes for a star to move in the eyepiece when the hand control arrow buttons are

pressed (especially when changing directions). The CGE anti-backlash features allows the user to compensate

for backlash by inputting a value which quickly rewinds the motors just enough to eliminate the play between

gears. The amount of compensation needed depends on the slewing rate selected; the slower the slewing rate

the longer it will take for the star to appear to move in the eyepiece. There are two values for each axis, positive

and negative. Positive is the amount of compensation applied when you press the button, in order to get the

gears moving quickly without a long pause. 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

e 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 re

tton, 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

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

bscured, 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 exp

Observing

–90º. This will display every object in the database lists regardless of whether it is visible in the sky from

Tip!

your location.

Direction Buttons –

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 Declination (north and south) or Right Ascension

(east and west) button directions and press ENTER. Select either positive or negative for both axes and press

ENTER to save. Setting the azimuth bu

at 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 -

This allows the user the ability to minimize the affects 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 Right Ascension (RA) and counterclockwise

eclination 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.

o 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.

Helpful

Hint!

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 it final goto approach. If t

ar 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.

– All mechanical gears have a certain amount of backlash or play between the gears. This

– When an alignment is complete, the telescope automatically knows which celestial objects are

lore the entire object database, set the maximum altitude limit to 90º and the minimum limit

The direction a star appears to move in the eyepiece changes depending on which side of

tton direction to positive will move the telescope in the same direction

lets the user define the direction that the telescope will approach when slewing to an object.

sults in a pause when pressing the

a mountainous location where the horizon is partially

he telescope approaches its alignment

in declination.