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Goto Alt-Az
- Allows you to enter a specific altitude and azimuth position 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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Scrolling through the MENU options will also provide access to several advanced utility functions within the NexStar such
as cord wrap and anti-backlash.
Cord Wrap
–
Cord wrap safeguards
against the telescope slewing more than 360º in azimuth and wrapping the power
cord around the base of the telescope. The cord wrap menu has two settings; batteries and power cord. By default, the cord
wrap feature is set to "batteries" when the telescope is powered on. If using the NexStar with a AC adapter, change the
setting to "power cord", this will activate the cord wrap feature.
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. Therefore, the anti-backlash compensation will have to be set higher. You will need to experiment with
different values; 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
Azm Backlash
Azm BacklashAzm Backlash
Azm Backlash
or
Alt Backlash
Alt BacklashAlt Backlash
Alt Backlash
and press ENTER. Enter a value
from 0-100 for both azimuth and altitude and press ENTER after each one to save these values. NexStar will remember
these values and use them each time it is turned on until they are changed.
For the best possible pointing accuracy, always center the alignment stars using the up arrow button and the right arrow
button. Approaching the star from this direction when looking through the eyepiece will eliminate much of the backlash
between the gears and assure the most accurate alignment possible.
Model Select –
When the NexStar is first powered on, the hand control display allows you to select your NexStar from a
list of different models. If for some reason the incorrect model was selected, the Model Select utility feature allows you to
re-select the proper NexStar model from the displayed list. Once the correct NexStar model has been selected the power
needs to be restarted before beginning the alignment procedure.
NOTE:
If your hand control has been pre-set at the
factory, it will say NexStar Ready - Custom when first turned-on. Do not use the Model Select feature to change the model
type; doing so may alter the telescope's pointing accuracy.
Observing
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