Slew Limits; Filter Limits; Direction Buttons; Goto Approach - Celestron 80LCM Manual

Slew Limits

Sets the limits in altitude that the telescope can slew without displaying a warning message The slew limits prevent the telescope tube from
slewing to an object below the horizon or slewing to an object that is high enough that the tube might hit one of the tripod legs However, the
slew limits can be customized depending on your needs For example, if you would like to slew to an object that is close to the zenith and are
certain that the tube will not hit the tripod legs, you can set the slew limits to 90º in altitude This will allow the telescope to slew to any object
above the horizon without warning

Filter Limits

When an alignment is complete, the LCM automatically knows which celestial objects are above the horizon As a result, when scrolling through
the database lists (or selecting the SKY TOUR function), the LCM 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 or not

Direction Buttons

The direction a star moves in the eyepiece varies depending on the accessories being used This can create confusion when guiding on a star
using an off-axis guider versus a straight through guide scope 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 to select either the Azimuth buttons (left and right) or Altitude buttons (up and down) and press ENTER Pressing ENTER again will
reverse the direction of the hand control buttons from their current state Direction Buttons will only change the eyepiece rates (rate 1-6) and
will not affect the slew rates (rate 7-9)

GoTo Approach

This 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 For example, if your telescope is back heavy from using heavy optical or photographic accessories attached to the back, you
would want to set your altitude approach to the negative direction This would ensure that the telescope always approaches an object from the
opposite direction as the load pulling on the scope
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
Cord Wrap
Cordwrap safeguards against the telescope slewing more than 360 degrees in azimuth and wrapping accessory cables around the base of the
telescope This is useful any time that the telescope is powered using an external power supply By default, the cord wrap feature is turned off
when the telescope is aligned in altazimuth and turn on when aligned on a wedge

UTILITY MENU

Scrolling through the MENU options will also provide access to several advanced utility functions
GPS On/Off
This feature is only available when using your telescope in conjunction with the optional GPS accessory It allows you to turn off the GPS
module If you want to use the LCM database to find the coordinates of a celestial object for a future date you would need to turn the GPS
module off in order to manually enter a date and time other than the present

Factory Setting

Returns the LCM hand control to its original factory setting Parameters such as backlash compensation values, initial date and time, longitude/
latitude along with slew and filter limits will be reset However, stored parameters such as PEC and user defined objects will remain saved even
when Factory Settings is selected The hand control will ask you to press the "0" key before returning to the factory default setting
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