iOptron HEM27EC Mounting GoTo: hybrid precision mounting with RA encoder
The iOptron HEM27 is a hybrid equatorial mount: strain wave drive on the right ascension axis, backlash-free worm and belt drive on the declination axis. Without a counterweight, it carries 13.5 kg (29.7 lbs) with a head weight of only 3.7 kg (8.15 lbs).
The EC version measures the right-hand climbing axis with a high-resolution encoder and corrects the periodic error in real time (RPEC). With short and medium focal lengths, you can take photos without autoguiding.
Prepared for the iPolar electronic pool locator, which can be added as an accessory.
Real-time error correction on the RA axis
The encoder continuously sends signals where strain wave drives are needed. Tight stars in long unlit exposures, without a guidescope, guiding camera, or extra cables.
For long brand point-to-point distances, the ST-4 port remains available.
Hybrid drive without counterweight
The combination of strain wave on RA and worm/belt on declination provides the load capacity of a harmonic drive with the refined tracking behavior of a traditional drive. A counterweight is unnecessary in most setups.
The electronic friction brake safely stops the mount during a power failure, and the power-down memory preserves position and alignment.
Complete control
The Go2Nova 8409 hand controller contains over 200,000 objects; Wi-Fi is routed through the hand controller, and computer control is possible via ASCOM, INDI, or iOptron Commander. Autoguiding via the ST-4 port and PEC correction are built-in.
The internal cable management and the dual Vixen/Losmandy-D saddle keep the photo setup tidy; the built-in zero-position finder automatically finds the starting position.
Included
- HEM27EC mounting head with RA encoder
- Go2Nova 8409 Hand Controller
- Transport bag
- Power supply and USB cable
Featured accessories
Expand the mount with the iPolar for SkyHunter and HEM27 for electronic polar alignment, and the HEM27 counterweight shaft for heavier setups.
For whom yes and for whom no
- ✓ Astrophotographers who want to take long exposures without guidance
- ✓ Who is looking for the highest precision in a travel mount
- ✗ Who doesn't need the encoder: the HEM27 with iPolar is more affordable
Specifications
| Type | Hybrid EQ mount, strain wave RA plus worm/belt DEC |
| Carrying capacity | 13.5 kg (29.7 lbs), without counterweight |
| Head of weight | 3.7 kg (8.15 lbs) |
| Manual | Go2Nova 8409, over 200,000 objects |
| Friction brake | Electronic |
| Connections | WiFi (via manual control), USB, ST-4 |
| Saddle | Dovetail, Vixen, and Losmandy-D |
| Tripod | Not included |
| Nutrition | 12 V DC |
| Error correction | Realtime via high-resolution RA encoder (RPEC) |
You can find more mounts and accessories for this brand at the iOptron brand page.
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