Celestron Nexstar Evolution 12090 Instruction Manual page 14

ANTI-BACKLASH
All mechanical gears have a certain amount of backlash or play between the gears This is seen as a delay in the time
it takes for the telescope to move after a direction arrow is pressed, especially when changing directions Anti-backlash
compensates for backlash by inputting a value which quickly rewinds the motors just enough to eliminate the play between gears
• Altitude - Sets the backlash compensation value for altitude (up/down motion of the telescope), 0-99
• Azimuth - Sets the backlash compensation value for azimuth (left/right motion of the telescope), 0-99
ALTITUDE SLEW LIMITS
The NexStar Evolution used with 6", 8", and 9 25" optical tubes will point straight overhead without obstruction Using oversized
accessories like DSLRs and T-adapters may require limiting the altitude angle to prevent striking the mount Note that the slew limit
does not work until the telescope is aligned with the sky, or the slew limit assumes the telescope is pointing horizontally
• Maximum - Sets the maximum (or highest) limit, 0-90º Use to prevent the telescope from striking the mount when oversized
accessories are attached
• Minimum – Sets the minimum (or lowest) limit, 0-90º This setting is useful when trying to avoid obstructed horizons
SLEW BUTTONS AT SLOW SPEEDS
Telescope direction can be reversed up/down and left/right to change the apparent motion of the star in the telescope's
eyepiece in the three lowest slew speeds Reverse Up and Down is default enabled so the star moves in the same direction
as the direction button
• Reverse Left and Right - Reverses left and right directions in the three lowest slew speeds
• Reverse Up and Down - Reverses up and down directions in three lowest slew speeds
ADVANCED
Advanced settings in NexStar Evolution allow you to adjust two power management features
• External Power - Sets the maximum potential current draw from the power supply Default is 2 0A for the included power
supply Any setting higher than 2.0 requires a higher capacity power supply, which is not included with the
telescope. The telescope has built-in fail safes if the External Power setting is incorrectly set, but we recommend always
using a suitable power supply for the given setting
When used with a higher capacity power supply, this setting allows you to charge the internal battery at the fastest speed
while using the telescope, and while optionally charging your smart device from the USB charger
• USB Charger - Sets the USB charger on the mount to always On or Auto Default is Auto, meaning the charger will shut
off to save battery life when the battery is low On will force the charger to stay on at all times, even when the battery is low
GOTO
Simply enter the Right Ascension (RA) and Declination
(Dec) coordinates to slew to a specified area of sky This
is the quickest way to go to a custom object, such as a
new comet or object of interest provided by a star chart or
online reference
14 I
ENGLISH