Why choose a Harmonic Drive mount
Harmonic Drive mounts have significantly changed the way modern astrophotography setups are designed. Thanks to their compact size, high mechanical rigidity and simplified balancing requirements, they are ideal for both portable imaging and advanced fixed setups.
ZWO has developed a complete range of harmonic drive mounts to cover different needs. In this guide, we compare the AM3N, AM5N and the new AM7, focusing on real-world use cases rather than marketing claims.
Quick overview: AM3N vs AM5N vs AM7
If you are looking for a fast answer: AM3N is designed for maximum portability and lightweight systems, AM5N represents the most balanced solution for many astrophotographers, while AM7 is intended for those who require higher payload capacity and certified precision.
| Model | Positioning | Key strengths | Best suited for |
|---|---|---|---|
| ZWO AM3N | Ultra-portable | Minimal weight, compact design, harmonic drive precision | Travel astrophotography and lightweight imaging setups |
| ZWO AM5N | Balanced all-rounder | High portability with increased payload capacity | Advanced amateur astrophotography with medium instruments |
| ZWO AM7 | High-capacity harmonic mount | Up to 30 kg payload, certified ±10 arcsec precision | Large optical tubes and demanding imaging systems |
ZWO AM3N: maximum portability
The ZWO AM3N is designed for astrophotographers who prioritize mobility. Its compact form factor and harmonic drive transmission allow for fast setup and transport, making it ideal for travel, star parties and remote observing locations.
It is particularly suitable for small refractors, camera lenses and lightweight imaging configurations where ease of use and transportability are key.
ZWO AM5N: the most versatile choice
The ZWO AM5N represents a natural evolution for users who need more flexibility without sacrificing portability. It supports higher payloads while maintaining a compact and lightweight design.
Thanks to its dual EQ / Alt-Az operating modes and full ASIAIR integration, it adapts easily to both astrophotography and general observational use.
ZWO AM7: harmonic drive without compromises
The ZWO AM7 is the flagship harmonic drive mount in the ZWO lineup. It offers a maximum payload capacity of up to 30 kg and a certified tracking precision of ±10 arcseconds, positioning it in a higher performance class.
Designed for demanding astrophotographers, the AM7 supports both equatorial and alt-azimuth modes, features integrated cable management on the saddle and provides seamless control through the ASIAIR ecosystem.
Which ZWO mount should you choose?
Your choice depends primarily on the weight of your optical setup, your mobility needs and how far you want to scale your system in the future:
- Choose AM3N if portability and minimal weight are your top priorities.
- Choose AM5N if you want a versatile, future-proof solution for medium-weight imaging setups.
- Choose AM7 if you need maximum payload capacity, higher precision and long-term system expansion.
Conclusion
ZWO’s harmonic drive mounts share a common philosophy: compact design, mechanical efficiency and seamless software integration. Whether you are building a travel-friendly setup or a high-performance astrophotography rig, the AM3N, AM5N and AM7 offer clear and well-defined solutions for different levels of complexity.