iOptron GEM28 User Manual

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Step 3. Attach mount head
Retract the 2x Azimuth (Azi) Adjustment Screws from both sides to leave ample space for the
alignment peg to be fitted in between the 2x Azi Adjustment Screws. Remove the 2x Azi Locking Screws
from the mount base and insert them into the opening next. Secure the mount head by tightening the Azi
Locking Screws into the M6 holes on the tripod.
Figure 9. Attach the mount
Level the mount by adjusting the tripod legs. Use the build-in Bubble Level Indicator or an external
leveler for this purpose.
Step 4. Adjust latitude
Loosen the Latitude Locking Lever. Turn Latitude Adj. Knob to adjust the latitude until the arrow
points to the current latitude on the Latitude Scale. You may use the Allen wrench for easy adjustment.
Tighten the Latitude Locking Lever.
Figure 10. Adjust latitude
You may lift the Latitude Locking Lever handle by push the Push Button on this ratchet lever to
disengage gear teeth and rotate freely for quick adjustment.
Before pulling the Allen wrench out from the RA axle, make sure the RA gear switch is locked, as
shown in Figure 11. There are three RA axle locking positions for the CEM26 mount: Zero Position, East
and West position.
Figure 11. Allen wrench to lock the RA axle and storage
Azi. Adj. Screw
Azi. Locking Screw
Lat. Adj. Knob
Latitude Scale
Wrench
Latitude Locking Lever
Push Button

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