iOptron GEM45
iOptron
iOptron GEM45 is a German equatorial mount for guided astrophotography rigs.
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Specifications
Mount
- Mount type
- German equatorial mount
- Modes
- Equatorial GoTo
- Material
- All-metal, CNC machined, red/black anodized
- Slew rate
- 4.5°/sec (1080X)
Capacity
- Payload
- 20 kg / 45 lb, excluding counterweight
- Mount weight
- 7.9 kg / 17.5 lb mount head
- Payload-to-weight ratio
- 2.53:1
Tracking
- Drive
- Precision 1.8° stepper motor, 128× microstep
- Transmission
- Synchronous belt with PPEC / real-time PEC
- Periodic error
- <±7 arcsec peak-to-peak (GEM45)
- Resolution
- 0.08"
- Max slew speed
- Up to ~4.5°/s
- Slew speeds
- 1×, 2×, 8×, 16×, 64×, 128×, 256×, 512×, max
Setup
- Latitude range
- 14°-68°
- Azimuth range
- ±6°
- Dovetail saddle
- 6-inch Losmandy-D / Vixen dual saddle
- Counterweights
- 5 kg / 11 lb counterweight
- Counterweight shaft
- Φ28 × 280 mm stainless steel shaft
- Polar scope
- Integrated iPolar electronic polar finder
Control
- Power
- 12V DC
- Controller
- Go2Nova hand controller
- Communication
- USB; optional Wi-Fi; built-in GPS
- Object database
- 212,000+ objects
- Guide port
- ST4-compatible autoguiding port
Specifications
- Tripod / pier
- 1.75\" Stainless Steel(~8kg), or optional Tri-pier
Astrophotography Fit
A general-purpose GoTo mount that should be chosen by realistic imaging payload, not headline capacity alone.
iOptron GEM45 is a flagship German equatorial mount for computerized tracking and guiding. Rated payload: 20 kg / 45 lb, excluding counterweight.
For long-exposure astrophotography, use a conservative imaging payload. The telescope, camera, guide hardware, dew heaters, dovetails, and cables all count, and guiding performance matters more than the catalog payload number.
Best paired with
- Autoguided refractors or corrected reflectors within conservative payload limits
- Stable tripod or pier and balanced counterweights
- Computer or hand-controller workflow with good polar alignment
Not recommended for
- Payloads at the rated maximum for imaging
- Users who need an airline-portable rig above all else
- Long focal length work without guiding and careful balance
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Astronomics Astronomics | $2,598.00 | In stock Updated 9/20/2026 | View Offer - $2,598.00 |
| Telescopes.net Telescopes.net | $2,598.00 | In stock Updated 9/20/2026 | View Offer - $2,598.00 |
| Cloud Break Optics Cloud Break Optics | $2,678.00 | In stock Updated 9/20/2026 | View Offer - $2,678.00 |
| Agena AstroProducts Agena AstroProducts | $2,859.00 | In stock Updated 9/19/2026 | View Offer - $2,859.00 |
| High Point Scientific High Point Scientific | $2,859.00 | In stock Updated 9/19/2026 | View Offer - $2,859.00 |
| Mile High Astronomy Mile High Astronomy | $2,949.00 | In stock Updated 9/20/2026 | View Offer - $2,949.00 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.