When choosing between the ZWO AM5N and ZWO AM3 mounts, the decision largely comes down to your payload requirements and how you plan to use the mount, whether for visual observation, astrophotography, or both. Both mounts are compact, lightweight harmonic drive systems with dual-mode capability (equatorial and alt-azimuth), making them ideal for portable setups and field work. The AM5N is the more robust of the two, with a higher payload capacity and included counterweight shaft, making it suitable for heavier telescopes and imaging rigs. The AM3, meanwhile, is designed for ultimate portability and simplicity, handling lighter setups without sacrificing performance.
Below is a breakdown of how each mount performs in two common scenarios: wide-field astrophotography and visual observing.
A Quick Comparison of the ZWO AM3 & ZWO AM5 Mounts
| Feature | ZWO AM5N | ZWO AM3 |
|---|---|---|
| Mount Type | Harmonic Equatorial / Alt-Az | Harmonic Equatorial / Alt-Az |
| Weight (Mount Head) | ~5 kg (11 lbs) | ~3.9 kg (8.6 lbs) |
| Payload Capacity (w/ counterweight) | 28 kg (61.7 lbs) | 13 kg (28.7 lbs) |
| Payload Capacity (no counterweight) | 13 kg (28.7 lbs) | 8 kg (17.6 lbs) |
| Counterweight Shaft | Included | Optional (sold separately) |
| Power Consumption | Similar (12V DC) | Similar (12V DC) |
| Mounting Base | Standard Vixen/Losmandy | Vixen/Losmandy dual saddle |
| WiFi & ASIAIR Integration | Full support | Full support |
| Encoder | No (AM5N is non-encoder version) | No encoder |
| Polemaster Compatibility | Yes | Yes |
| Latitude Adjustment | 0°–90° | 0°–90° |
Key Differences & Considerations
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Payload Capacity:
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AM5N can handle significantly heavier setups especially with counterweights. Ideal for larger scopes like 8–10" SCTs, refractors up to ~130mm.
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AM3 is more limited and suited to lighter payloads, like small refractors (≤90mm) or lightweight imaging setups.
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Portability:
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AM3 is lighter and more compact, making it ideal for travel or grab-and-go setups.
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AM5N is still portable but better suited to observatory or backyard setups with more gear.
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Counterweight Shaft:
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Included with AM5N, which improves payload versatility.
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Optional for AM3, limiting heavier imaging payloads unless added.
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Price:
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AM5N is more expensive, but justified by higher capacity and included accessories.
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AM3 offers excellent performance at a lower price for lighter gear.
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Wide Field Astrophotography
If your focus is wide-field astrophotography using a lightweight refractor (such as a 61mm–90mm triplet), a DSLR or cooled astro camera, and a portable controller like the ASIAIR Plus, the ZWO AM3 is often the better fit. It’s extremely compact and weighs only around 8.6 lbs, making it perfect for travel and quick setup in the field. It can handle imaging setups up to 8 kg (17.6 lbs) without the need for a counterweight, which covers most wide-field rigs. For example, a RedCat 51 paired with a ZWO ASI2600MC and an ASIAIR controller would be a comfortable load for the AM3. Its low power consumption and portability make it ideal for mobile imaging or quick backyard sessions.
The ZWO AM5N, if you're planning to grow or already own heavier gear, the AM5's larger capacity allows you to use heavier refractors or dual imaging setups, and the included counterweight shaft makes it more flexible with complex rigs. The AM5N makes more sense if you’re future-proofing or if your current imaging train includes heavier components like filter wheels, off-axis guiders, or longer focal length scopes.
Visual Observing
For visual observing, the ZWO AM3 stands out for its portability and ease of use. Its ability to switch quickly to Alt-Az mode means you can skip polar alignment entirely and be observing within minutes, perfect for casual backyard stargazing or public outreach. It works beautifully with small refractors, Maksutov-Cassegrains up to 127mm, and even some lightweight SCTs. Because of its smooth and quiet tracking, it enhances the experience without being intrusive or burdensome to set up. If your visual equipment is under 8 kg and you value grab-and-go convenience, the AM3 is hard to beat.
The ZWO AM5N becomes the better option if your visual setup involves a heavier OTA, such as an 8" Schmidt-Cassegrain or a longer 130mm APO. Its higher weight capacity and included counterweight shaft allow for more stability and smoother motion with larger optical tubes, especially when using heavy eyepieces or diagonals. While it’s not quite as lightweight as the AM3, it still remains portable enough for regular transport and field use. If your visual gear is larger or if you want a mount that can do both serious visual and astrophotography work, the AM5N is the more versatile option.
