iOptron CEM40
iOptron
iOptron CEM40 is a GoTo equatorial mount for guided astrophotography rigs.
mount $$$
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Specifications
Mount
- Mount type
- Chinese Equatorial Mount (CEM)
- Drive system
- 17 mm
- Payload capacity
- 2.5
- Mount weight
- 7.2 kg (15.8 lb)
- Counterweight
- Ø20 x 410 mm (SS, 1 kg)
- Latitude range
- 0 ～ 60° (special CW shaft mounting if < 10°)
Motion
- Slew rate
- 4.5°/sec (1080x)
- Tracking accuracy
- < ±7 arcsec / < 0.25 arcsec RMS (EC)
Specifications
- Power
- DC 12V, 5A
Electronics
- Controller
- Go2Nova 8407+; 8 line 21 character LCD
Mechanical
- Tripod / pier
- 1.5", 1.75" tripod options
Astrophotography Fit
A general-purpose GoTo mount that should be chosen by realistic imaging payload, not headline capacity alone.
iOptron CEM40 is a premium GoTo equatorial mount for computerized tracking and guiding.
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 |
|---|---|---|---|
| Mile High Astronomy Mile High Astronomy | $1,899.00 | In stock Updated 5/12/2026 | View Offer - $1,899.00 |
| Cloud Break Optics Cloud Break Optics | $2,448.00 | In stock Updated 5/10/2026 | View Offer - $2,448.00 |
| High Point Scientific High Point Scientific | $2,889.00 | In stock Updated 5/13/2026 | View Offer - $2,889.00 |
| Telescopes.net Telescopes.net | $2,889.00 | In stock Updated 5/14/2026 | View Offer - $2,889.00 |