Meet iOptron's latest game-changer in the world of compact German equatorial mounts—the GEM28! This next-gen mount is a lightweight wonder, tipping the scales at just 10 lbs, but don't let its small footprint fool you. It boasts a remarkable 28 lb payload capacity, giving you a 2.8:1 mount-to-payload ratio. How'd we pull this off? By incorporating design techniques honed in our CEM mount series, aimed at minimizing mass.

For fans of classic German EQ designs who also want the flexibility to operate at a wide range of latitudes, this one's for you. Plus, we've packed it with features that make your life easier, whether you're a casual stargazer or a seasoned astrophotographer. Get the ease of a positive lock gear engagement system—glove-friendly, by the way—and seamless connectivity through built-in Wi-Fi. Permanent Periodic Error Correction (PPEC) ensures optimal tracking, time and time again.

What's under the hood? Advanced GOTONOVA® GOTO tech powers the GEM28, turning it into a navigational powerhouse with a massive 212,000-object library. The Go2Nova® Hand Controller's 4-line LCD screen streamlines setup and object location, making the user experience a breeze.

Still not impressed? The mount comes standard with an AccuAlign™ optical polar scope, a heavy-duty 1.5" stainless steel tripod, and a sturdy aluminum carrying case. All neatly packed into two shipping boxes for your convenience.

Shipping Details:

Box #1: G282B-GEM28 Head with AccuAlign, Case, and Tray (G282B)
Box #2: 8281-CEM26/GEM28 1.5" Tripod without Tray (C26/G28 1.5T)

Key Features:

German equatorial design compatible with latitudes from 10° to 70°.
Stellar for both visual observations and astrophotography.
Low periodic error, clocking in at less than ±12 arc seconds.
A 12.7 kg (28 lbs) payload, with a mount-only weight of 4.5 kg (10 lbs).
Crafted from CNC machined and cast metal.
Spring-loaded gear mechanism.
Quick-lock gear clutches that are a cinch to operate.
Energy-efficient stepper motor.
AccuAlign™ calibrated polar scope included.
Can't see the Pole Star? No problem—special polar alignment routine.
Go2Nova® 8409 controller featuring Advanced GOTONOVA® GOTO tech.
Integrated ST-4 autoguiding port.
Built-in Wi-Fi and a USB port for updates and computer control.
Heavy-duty 1.5-inch stainless steel tripod weighing 5kg.
Metal tripod spreader with accessory tray.
Hard carrying case for protection.
Optional add-ons: 32-channel GPS and iGuider™ autoguiding system (#3360).

So there you have it—the GEM28 is setting the new standard for compact, feature-rich German equatorial goto mounts.

Specifications

Mount	German Equatorial Mount
Payload *	28 lbs (12.7kg), exclude counterweight
Mount weight	10 lbs (4.5kg)
Payload/Mount weight	2.80
Structure Material	All metal, Casting + CNC machined
Exterior Finish	Powder coating
Periodic error (PE) **	<±12 arcsec
PEC	Yes, Permanent PEC
Worm period	600 sec
Right Ascension worm wheel	Φ88mm, 144 teeth aluminum
Declination worm wheel	Φ88mm, 144 teeth aluminum
Right Ascension axis shaft	Φ35mm steel
Declination axis shaft	Φ35mm steel
Right Ascension bearing	Φ55mm ball bearing
Declination bearing	Φ55mm ball bearing
Worm gears	Φ15.2mm, Brass
Motor drive	1.8º stepper motor, 128X microdivision
Resolution	0.17 arc seconds
Transmission	Synchronous belt
Latitude adjustment range	10º ~ 70º
Azimuth adjustment range	± 6º
Polar Scope	AccuAlign^TM optical 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(6º/sec)
Power consumption	0.6A(Tracking), 0.9A(GOTO)
Power requirement	12V DC, 5A
AC adapter	100V ~ 240V (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	Φ20X200mm (M16), Stainless Steel
Shaft extension	Φ20X120mm (M16), Stainless Steel
Counterweight	10 lbs (4.5kg)
Tripod	1.5" Stainless Steel (5kg)
Dovetail saddle	3.8" Vixen-style, center adjustable
Carrying case	Included
GPS	Optional external 32-channel GPS
Autoguiding	Optional external iGuider 1
Operation temperature	-10ºC ~ 40ºC
Warranty	Two year limited

* OTA size and length dependent, smaller than 6" in diameter recommended
** Measured with encoder on bench, 10 minutes

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iOptron GEM28 in Hard Case

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