Manufacturer: iOptron
Product number: G281B1

EUR 1.490,00RRP EUR 1.859,00you save 19.8% (EUR 369,00)


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iOptron GEM28 with optical polar scope and 1.5" tripod
The new compact next generation German mount from iOptron - the GEM28! Like its predecessors, the GEM28 was designed with mobility in mind. Weighing only 4.5 kg, it can carry up to 12.7 kg of payload.

Building on the legacy of previous GEM models, iOptron has added attractive features for greater convenience and functionality.
A gear engagement system with positive locking (easy to operate even with gloves on)--.
Integrated Wi-Fi, which provides unparalleled connectivity.
A storable permanent periodic error correction (PPEC) for repeating optimal PEC training sessions. This improves tracking accuracy for astrophotography.
Fast polar alignment through the optical polar scope AccuAlign
An electronic polar alignment method for those who do not have a clear view of Polaris.
CNC-machined and cast metal housing.
Large, easy-to-use quick-release couplings
Integrated ST-4 autoguiding connector
Built-in Wi-Fi
USB port for firmware upgrade and computer control
Standard 1.5-inch heavy-duty stainless steel tripod (5 kg)
Die-cast metal tripod spider with accessory tray
Optional 32-channel GPS (Global Positioning System)

The GEM28 is equipped with the latest advanced GOTONOVA® GOTO technology
This makes it one of the most powerful and accurate GOTO mounts on the market. The library of 212,000 entries ensures that you will never run out of objects to see or image. The Go2Nova® handheld controller is intuitive to use and its large 4-line LCD screen simplifies telescope setup and object finding.

Tripod Connection:
The mount is attached to the tripod from above with two M6 screws (see illustration). This allows an easy adaptation to own tripod constructions or also pier adapters.
Mount:German Equatorial Mount
Payload:28 lbs (12.7 kg), exclude counterweight
Mount weight:10 lbs (4.5 kg)
Payload/Mount weight:2.80
Structure Material:All metal, Casting + CNC machined
Exterior Finish:Powder coating
Periodic error (PE):<±10 arcsec
PEC:Yes, Permanent PEC
Worm period:600 sec
Right Ascension worm wheel:D=88 mm, 144 teeth, aluminum
Declination worm wheel:D=88 mm, 144 teeth, aluminum
Right Ascension axis shaft:D=35 mm, steel
Declination axis shaft:D=35 mm, steel
Right Ascension bearing:D=55 mm ball bearing
Declination bearing:D=55 mm ball bearing
Worm gears:D=15.2 mm, brass
Motor drive:1.8° stepper motor, 128X microdivision
Resolution:0.17 arc seconds
Transmission:Synchronous belt
Latitude adjustment range:10° to 70°
Azimuth adjustment range:± 6°
Polar Scope:AccuAlign polar scope
Level indicator:Level bubble
Hand Controller:Go2Nova® 8409 with ~212,000 objects database
Tracking:Automatic
Slew speed:1×, 2×, 8×, 16×, 64×, 128×, 256×, 512×, MAX (6°/sec)
Power consumption:0.6 A (Tracking), 0.9 A (GoTo)
Power requiremention:12 V DC, 5 A
AC adapter:100 V to 240 V (included)
Power-down memory:Yes
Wi-Fi:Built-in
Communication port:Yes (Wi-Fi and USB)
Autoguide port:Yes (ST-4 compatible)
Firmware upgrade:Yes
PC computer control:Yes (ASCOM)
Counterweight shaft:D=20 x 306 mm (M16), stainless steel
Shaft extension:D=20 x 120 mm (M16), stainless steel
Counterweight:10 lbs (4.5 kg)
Tripod:1.5" stainless steel (5 kg)
Dovetail saddle:2" Vixen-style, center adjustable
GPS:Optional external 32-channel GPS
Autoguiding:Optional external iGuider 1
Operation temperature:-10 °C to 40 °C
Telescope mount with AccuAlign polar scope
Hand controller (HC) - Go2Nova® 8409
Tripod with accessory tray - 1.5?inch
Counterweight - 10 lbs (4.5 kg) x1
Counterweight shaft
Controller cables x2
RS232?RJ9 serial cable
AC adapter - 100?240 V

Adjusting worm gear play
In case you need or want to adjust the gear play in the worm gears, there is guide as PDF: cem26-gem28-worm-play-fix.pdf


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