iOptron GEM28 User Manual

20
STEP 11. Return Mount to Zero Position
After polar alignment and balancing OTA, return the mount to Zero Position. The Zero Position is the
position with the CW shaft pointing toward the ground, OTA at the highest position with its axis parallel to
the polar axis and the OTA pointing to the Celestial Pole.
To set the mount to Zero Position, press MENU=>”Zero Position”=>”Set Zero Position”. Release
the Gear Switch to manually return the mount to Zero Position, or use the hand controller to slew the mount
to Zero Position. Press ENTER to confirm the zero position.
Set the Zero Position or check the Zero Position by using MENU=>”Zero Position”=>”Goto Zero
Position” before each session.

iOptron GEM28 Specifications

General

Payload Capacity	28 lbs (12.7 kg)
Mount Weight	10.4 lbs (4.7 kg)
RA Worm Gear Material	Brass
DEC Worm Gear Material	Brass
Tracking Rate	Sidereal, Lunar, Solar
Autoguiding Port	Yes
Communication Port	USB
Tracking Accuracy	± 5 arcsec
Weight	10.4 lbs (4.7 kg)
Mount Type	Equatorial
RA Worm Wheel	180 teeth
DEC Worm Wheel	180 teeth
Motor Drive	Stepper motor
Power Requirement	12V DC
GPS	Built-in
Polar Scope	Yes, included
Counterweight Shaft	Ø20 mm
Worm Gear Period	600 seconds