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the time of observing. Since these objects are relative to the location of the telescope, they
are only valid for that exact location. To save land objects, once again center the desired
object in the eyepiece. Scroll down to the "Save Land Obj" command and press
ENTER. The display will ask you to enter a number between 1-200 to identify the object.
Press ENTER again to save this object to the database.
Enter R.A. - Dec: You can also store a specific set of coordinates for an object just by entering the R.A. and
declination for that object. Scroll to the "Enter RA-DEC " command and press ENTER.
The display will then ask you to enter first the R.A. and then the declination of the desired
object.
GoTo Object: To go to any of the user defined objects stored in the database, scroll down to either GoTo
Sky Obj or Goto Land Obj and enter the number of the object you wish to select and
press ENTER. NexStar will automatically retrieve and display the coordinates before
slewing to the object.
To replace the contents of any of the user defined objects, simply save a new object using one of the existing identification
numbers; NexStar will replace the previous user defined object with the current one.
Get RA/DEC - Displays the right ascension and declination for the current position of the telescope.
Goto R.A/ Dec - Allows you to input a specific R.A. and declination and slew to it.
To store a set of coordinates (R.A./Dec) permanently into the NexStar database, save it as a User Defined Object as
described above.
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Setup Time-Site
- Allows the user to customize the NexStar display by changing time and location parameters (such as
time zone and daylight savings).
Anti-backlash – – All mechanical gears have a certain amount of backlash or play between the gears. This 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 NexStar's 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. 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.
NexStar will remember these values and use them each time it is turned on until they are changed.
Slew Limits – Sets the limits in altitude that the telescope can slew without displaying a warning message. By default the
slew limits are set to 0º to 90º and will only display a warning message if an object is below the horizon. However, the
slew limits can be customized depending on your needs. For example, if you have certain photographic accessories attached
to your telescope preventing it from pointing straight-up, you can set the maximum altitude limit to read 80º, thus preventing
the telescope from pointing to any objects that are greater than 80º in altitude without warning.
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