The ZWO AM3N Harmonic Equatorial Mount delivers precise harmonic-drive performance in a lightweight, travel-friendly package. With dual Equatorial and Alt-Az modes, a clean cable-management layout, and a surprisingly strong payload for its size, the AM3N is an excellent choice for portable deep-sky imaging and visual observing.
What’s new in AM3N vs AM3
- Integrated USB-C and 12 V outputs on the saddle for clean cable routing.
- Magnetic hex-key storage and improved ergonomics.
- Subtle mechanical refinements while keeping the same ultra-portable footprint.
Key benefits
- Portable performance — approx. 4.1 kg mount head with high-torque harmonic gearing.
- Versatile operation — choose EQ mode for long-exposure imaging or Alt-Az for visual/EAA.
- Clean cable management — on-saddle power and data minimise cable drag and snag risk.
- Dual-standard saddle — supports Vixen and Losmandy dovetails.
- Field-ready adjustments — smooth altitude and azimuth controls for quick alignment.
Technical specifications
| Drive system | Strain-wave (harmonic) + synchronous belt, 300:1 reduction |
|---|---|
| Operating modes | Equatorial (EQ) and Alt-Azimuth (AZ) |
| Periodic error | ≤ ±15″ (period ≈ 288 s) |
| Payload capacity | Up to 8 kg without counterweight; up to 13 kg with counterweight |
| Mount weight | ≈ 4.1 kg |
| Saddle | Dual Vixen & Losmandy |
| Altitude adjustment | 0°–90° |
| Azimuth adjustment | ±6° |
| On-saddle I/O | USB-C data + 12 V DC output |
| Counterweight bar thread | M12 × 1.75 |
| Supported counterweight | ≤ 5 kg; recommended bar ≤ 25 cm |
Recommended accessories
- TC40 carbon-fibre tripod or similar compact field tripod.
- M12 counterweight bar and ≤ 5 kg counterweight for heavier optical loads.
- Stable 12 V power source to make use of the saddle I/O ports.
FAQs
Do I need a counterweight?
Most setups up to around 8 kg work counterweight-free. For heavier imaging trains or improved wind performance, use the M12 bar and a ≤ 5 kg counterweight (≤ 25 cm bar length).
Can I switch between EQ and Alt-Az?
Yes. Use EQ mode for long-exposure astrophotography and Alt-Az mode for visual or EAA. Switching modes is fast and doesn’t affect portability.
What periodic error should I expect?
Typical periodic error is ≤ ±15 arcseconds with a ~288-second cycle. Good balance and accurate polar alignment help optimise guiding.
Will my dovetail fit?
Yes — the dual saddle supports both Vixen and Losmandy dovetail plates.
What’s improved in AM3N?
The AM3N adds integrated saddle I/O, ergonomic tweaks, magnetic tool storage, and minor mechanical refinements while retaining the trusted AM3 performance.