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iOptron GEM28 User Manual

iOptron GEM28
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13
The Allen wrench can be stored on the bottom of the mount, as show in Figure 11.
Step 5. Install counterweight (CW) shaft
(1) Remove CW Shaft Locking Screw.
(2) Insert CW Shaft into the CW Mounting House.
(3) Thread in the CW Shaft Locking Screw from the other side.
(4) Tighten the Front CW Position Screw.
Figure 12. Install counterweight shaft
At very low latitudes (<10°), to avoid CW bumping into tripod leg, retreat the Front CW Positioning
Screw while turn the Rear CW Position Screw (a hex head set screw) to tilt the CW shaft outwards.
Figure 13. Counterweight shaft at low latitude
Step 6. Install counterweight
Before putting on CW, make sure the mount is at its zero position, i.e., CW shaft points to the
ground. Insert Allen wrench to lock the RA axle and disengage the R.A. Gear Switch to set the R.A. axis
free before loading the CW. Remove the CW Safety Cap at the end of CW Shaft. Glide the CW over the
shaft with the larger opening facing down. Tighten the CW Locking Screw to hold the CW in place. Place
the Safety Cap back onto the shaft. Move the CW to the bottom of the shaft and tighten the CW locking
Screw.
CEM26 comes with a 10.4 lbs (4.7 kg) CW, which should be sufficient for an 6 scope with total
payloads up to about 13 lbs (6kg). Use extra CW or CW Extension Bar to balance higher payloads.
CW Shaft Locking Screw
CW Shaft Mounting House
(1)
(2)
Insert CW Shaft
into CW
Mounting House
(3)
(4)
Front CW Position Screw
Rear CW Position Screw

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iOptron GEM28 Specifications

General IconGeneral
Payload Capacity28 lbs (12.7 kg)
Mount Weight10.4 lbs (4.7 kg)
RA Worm Gear MaterialBrass
DEC Worm Gear MaterialBrass
Tracking RateSidereal, Lunar, Solar
Autoguiding PortYes
Communication PortUSB
Tracking Accuracy± 5 arcsec
Weight10.4 lbs (4.7 kg)
Mount TypeEquatorial
RA Worm Wheel180 teeth
DEC Worm Wheel180 teeth
Motor DriveStepper motor
Power Requirement12V DC
GPSBuilt-in
Polar ScopeYes, included
Counterweight ShaftØ20 mm
Worm Gear Period600 seconds

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