Harmonic drive (or strain wave) mounts have recently revolutionized the world of astrophotography. Their promise? An exceptional load/weight ratio and the ability to dispense with counterweights, all with unrivalled compactness... Clearly, the itinerant astrophotographer can now take along a lightweight mount capable of carrying a telescope normally reserved for much heavier mounts. As an experienced enthusiast (the E-E-A-T method obliges), I've scoured user feedback on forums (Webastro, Astrosurf, Cloudy Nights, etc.) to offer you a comprehensive, critical comparison of three popular "mid-range" harmonic mounts: the ZWO AM5N, the Pegasus Astro NYX-101 and the iOptron HAE29. We'll take a detailed look at their technical features and strengths/weaknesses, as well as the opinions of seasoned amateur astronomers who have tested them in the field, to help you choose the harmonic mount that best suits your astrophotography needs.
The ZWO AM5N mount is compact and lightweight (shown here mounted on the ZWO carbon tripod). This 2024 model retains the characteristic red look of the AM5, but introduces significant internal improvements. The AM5N is aimed at astrophotographers looking for a portable solution without compromising on load capacity.
ZWO (Zhuhai ZWO Co.) struck back in 2022 with the launch of the AM5, one of the first consumer harmonic mounts, acclaimed for its portability and integration with the ZWO ecosystem (notably the ASIAIR controller). In 2024, ZWO unveiled the AM5N, an improved version that takes up the red aluminum chassis of the AM5 while correcting its minor teething problems. What does the new AM5N bring? Essentially, more precision, payload and user-friendliness:
- Payload without counterweight: 15 kg, versus ~13 kg for the previous version . With a counterweight, the capacity remains around 20 kg (ZWO recommends ~44 lbs or 20 kg max with counterweight) . In other words, the AM5N can carry a well-equipped 130 mm scope or a small Newton without counterweight, and with counterweight a 200 mm Cassegrain, for example.
- Head weight: only ~5.5 kg (12.1 lbs). The load/weight ratio is therefore a remarkable 3 to 1 (5 times lighter than an equivalent EQ6-type mount).
- Improved tracking accuracy: the periodic error (PE) has been halved to ±10 arcseconds. In practice, this does not dispense with autoguiding on long focal lengths, but the corrections required are less frequent and smoother, improving guidance. Tests on the sky show guidance RMS typically around 0.3-0.5″ of arc with the AM5N, an excellent result for this category.
- New features: the AM5N now incorporates an internal cable duct in the DEC axis (with 12 V and USB-C output on the turntable) to prevent tangling during meridian flips. No more fear of the cable stretching out and making you miss poses in the middle of the night! What's more, ZWO has added Bluetooth in addition to Wi-Fi, making it easier to connect without blocking the phone's Internet access (a shortcoming of the original AM5 in direct Wi-Fi mode). Latitude/azimuth adjustment has also been overhauled: a new spring-loaded locking system ensures that the polar setting remains firmly in place when the axes are locked - a welcome improvement to avoid shifting the alignment when tightening the screws.
In terms of use, ZWO's philosophy remains the same: simplicity and integration. The mount doesn't come with a traditional GoTo control paddle as standard (unlike iOptron, for example). It is controlled via a mobile application (ZWO AM, or more commonly ASIAIR Plus for owners of this accessory) or via a PC (ASCOM driver). This may disconcert snowshoe regulars, but many of today's astrophotographers use a PC or Raspberry Pi anyway, for plate-solving, autoguiding and so on. This is not a problem for amateur astrophotographers: you set up your telescope using the dedicated module (e.g. Sharpcap, NINA, or the ASIAIR plate solving), then let the software point to the objects in the sky. Note that the AM5N also supports alt-azimuth mode (useful for visuals) over a latitude range from 0 to 90°, like the original.
As for performance in the field, feedback has been very positive. One user on Cloudy Nights points out that his first-generation AM5 "exceeded [his] expectations", with consistent guidance at 0.5-0.8″ RMS depending on seeing. The more accurate AM5N would often achieve even better (we saw ~0.3-0.4″ RMS in tests). With such high tracking quality, exposures of 5-10 minutes are quite feasible with autoguiding, without trailed stars. For example, one astram reports making 10 min exposures with a Newton Quattro 200 mm and an EdgeHD 8″ on his AM5 (setup ~10 kg) with an average guidance of 0.45″ RMS. Impressive for a mount of this size!
Several owners of the AM5 confirm that it can withstand loads close to the limit without flinching, as long as the static balancing is correct (a small counterweight can be added to stabilize if necessary). On Webastro, for example, we note that with a ~10 kg tube (115 mm + APN), "the AM5 is a good solution" according to one user, avoiding the need to upgrade to a more expensive range. Another astrophotographer says "I don't even worry about weight anymore", I use an EdgeHD 8 and a Newton 200 mm fully equipped on the AM5 with no problem, 10 min exposure and it guides under 0.5″ RMS" . Obviously, in strong winds, a lightweight mount will remain more sensitive than a 20 kg mount: securing the tripod well (weight on the hook, stays between the legs) is recommended for large F/D equipment in wind grip.
In terms of ergonomics, ZWO has taken its product to the next level. The AM5N corrects some of the shortcomings of the first version: it now offers internal cable routing (the first AM5 left cables on the outside, requiring careful manual management or the use of a wrap to prevent them from getting caught somewhere during movement ). The absence of this function on the AM5 had been pointed out in comparison with the iOptron HAE29, which integrated an internal cable path - ZWO listened and corrected the shot. Similarly, the AM5's plastic knobs (e.g. for altitude) looked a bit "cheap" compared to the iOptron's all-metal ones; on the AM5N, the base design has been reworked and seems more robust, even if the mount remains mostly aluminum and reinforced plastic where necessary (the saddle, on the other hand, is of very good quality, far superior to the iOptron's original one according to some).
On the other hand, the AM5N still has no internal storage of polar alignment or position after switch-off: it has to be reset at each session, and automatically stops at the meridian with no possibility of following a little beyond  In practice, this isn't really a problem, as software such as NINA or ASIAIR are very good at handling the meridian turnaround in due course, but it should be noted that the ZWO mount depends on this external control for certain advanced functions (no "programmable tracking limits" or multi-star pointing model natively, unlike iOptron ). ZWO clearly relies on remote intelligence (PC, Raspberry Pi...) rather than in the mount itself. This "all software-driven" approach is well suited to astrophotographers already accustomed to automation solutions. For a complete beginner astramer, however, the learning curve will be a little higher than using a traditional snowshoe - but rest assured, numerous tutorials and an active community exist to help you master the AM5N.
In summary, the ZWO AM5N appears to be a highly accomplished and versatile harmonic mount for 2024. It offers an excellent compromise between lightness (transportability), sufficient payload for most amateur configurations, and improved tracking accuracy that makes it even more reliable for deep-sky imaging. Its seamless integration with ASIAIR and the ZWO ecosystem is a real plus if you're already using their cameras and accessories. As one English-speaking user, who invested in the AM5 after extensive research, sums up: "Even today, would I change my AM5 for the NYX-101? No, at least not for my little scope" . This confidence testifies to the general satisfaction around the AM5. Of course, if one day he moves on to a considerably heavier tube (a large 130 mm astrograph, for example), he'd "take a close look at the NYX"  - let's take a look at what the Pegasus NYX-101 has to offer in just such a scenario.
The Pegasus Astro NYX-101 is distinguished by its black and blue design and sturdy construction. In this image, the mount is attached to an EQ6 tripod by means of an adapter. This mount offers an interesting balance between a very high load capacity and an even smaller footprint for its category.
Pegasus Astro is a European brand (based in Greece) well known for its astrophotography accessories (PowerBox, focusing motor, etc.). In 2022, it made a remarkable entry into the mount market with the NYX-101, its first equatorial mount with harmonic transmission. Positioned a notch above ZWO's AM5 in terms of capacity and price, the NYX-101 is clearly aimed at demanding astrophotographers who want a lightweight high-end mount capable of carrying larger tubes without counterweight  . The name "Nyx" comes from the Greek goddess of Night: a nod to Pegasus' origins and the instrument's nocturnal vocation.
- Payload without counterweight: 20 kg (44 lbs)  . That's around 30% more than the AM5N and HAE29, putting the NYX-101 at the top in this comparison for capacity. In concrete terms, 20kg without counterweights means that a larger-diameter or highly-equipped telescope (e.g. a 9.25″ SCT + accessories, or a 250mm carbon Newton) can be considered without the need for counterweights. "The NYX can carry up to 30 kg with counterweights" states Pegasus Astro , which means that by adding a bar and a few (optional) weights, you can still extend the load for imaging (although 30 kg is starting to exceed the reasonable for a 6 kg mount, that's the absolute limit advertised). At the time of its release, Webastro noted that this mount "can carry up to 30 kg with counterweight", but that it had only just become available - proof of its atypical positioning for such a small format.
- Head weight: 6.4 kg (14.1 lbs). This makes it slightly heavier than its direct competitors (almost 3 kg heavier than the HAE29, ~0.9 kg heavier than the AM5N). This extra weight is due to the slightly heavier mechanics (larger motors, stronger RA/DEC axle sprockets) used to support the increased load. However, 6.4 kg is still very light compared to conventional equatorial mounts capable of carrying 20-30 kg (an EQ6-R weighs 17 kg, for example). The load/weight ratio is a remarkable ~3.1.
- Accuracy and tracking: Pegasus does not provide an official "raw" periodic error figure, but user feedback indicates behavior similar to other harmonic mounts of this size, i.e. autoguiding is required for long focal lengths. The mount has an error period of around 430 seconds related to harmonic reducers . Pegasus actually recommends the use of PPEC (Predictive PEC) in PHD2 to optimize guidance , taking advantage of the regular nature of the periodic error. In practice, users obtain guidance around 0.6-0.8″ RMS with a C9.25 (2350 mm focal length) on the NYX-101, which is very correct for this demanding focal length . With shorter focal lengths (≤1000 mm), keeping well below the arcsecond of error is easy. An astro-photographer shares, for example, "I was painstakingly trying to get under 1″ of error with my old CGEM mount, whereas with the NYX I managed it from the very first session, effortlessly."
- Internal technology: The NYX uses high-precision harmonic gearboxes on both axes (500:1 reduction in RA, 300:1 in DEC) coupled to hybrid stepper motors via belts. This ensures backlash-free transmission and high torque. All this is controlled by sophisticated electronics, with advanced functions such as an electromechanical brake on the RA axis. This brake activates at standstill to prevent the telescope from tilting when the mount is switched off  (as harmonics have no intrinsic self-locking) and also serves as a safety device at the end of travel (tracking limit) or in the event of a power cut. In addition, the NYX incorporates tilt sensors (electronic level) to aid approximate initial stationing by displaying altitude and azimuth when the mount is horizontal. Finally, Pegasus has even included temperature and pressure sensors to apply dynamic atmospheric refraction correction in tracking - a detail more useful on long focal lengths (SCT) to slightly refine pointing/tracking accuracy.
In terms of ergonomics and control, Pegasus has opted for versatility. The mount can be controlled in several ways: via PC software (ASCOM or INDI driver, compatible with SkyX, NINA, etc.), via a proprietary mobile application (Pegasus Unity or a dedicated app) thanks to the built-in Wi-Fi, or even via a paddle. In fact, although the racket is not included as standard, Pegasus offers a small manual control racket as an option (sold for ~€180) for those who want it  . This makes it possible, for example, to use it in visual mode without a PC. The mount also offers an ST-4 port for classic autoguiding and LX200 compatibility for SkySafari  . It's worth pointing out that everything can work simultaneously: you can connect the mount to Wi-Fi and USB2 at the same time  , handy for monitoring it via several devices. This software flexibility is a strong point of the NYX-101.
On the practical mechanical side, the NYX-101 offers a universal double dovetail stage (Vixen + Losmandy), a polar axis tiltable from 0 to 90° (so EQ or Alt-Az use) with micrometric altitude and azimuth adjustments . Pegasus supplies a QHY PoleMaster  polar finder adapter - a popular accessory for assisted stationing - since the mount has no built-in optical polar finder (which is common on these compact mounts). The user can therefore choose to use the PoleMaster, or simply perform camera-assisted stationing (via Sharpcap or NINA, for example).
In the field, feedback shows a mount that's generally much appreciated for its stability and ability to carry large tubes without counterweights. One astrophotographer reports that the NYX carries his EdgeHD 925 tube (≃13.5 kg equipped) "as if it wasn't even there, and without counterweight", whereas with his previous mount he had to use multiple tuning tricks to achieve sub-arcsecond tracking  . He adds that he "achieved <1″ guidance error on the first outing", which would have been impossible for him before  . What's more, cable management is made easier for him thanks to Pegasus' Saddle Powerbox option (a kind of distribution box attached to the board), which makes accessory mounting and power supply cleaner . Despite some initial discussions about the difficulty of setting up (some found the screws a little hard to adjust at first), most users note that "the polar[align] of the NYX is easy and precise" and that there are no particular worries  . The whole package remains much more transportable than a big EQ6, which motivates many buyers coming from heavier classic frames: "when my CGEM (20+ kg) gave up the ghost, the NYX was the perfect upgrade, a real change from day to night in terms of weight to carry and performance".
The NYX-101 is therefore aimed at users who are prepared to invest a little more to gain performance margin, or who already own an imposing instrument that no other lightweight mount can handle properly. For others, the AM5N and HAE29 may offer a better performance/price ratio if 13-15 kg of load is more than sufficient. We shall see that the iOptron HAE29, in particular, is the champion of portability, even if it sacrifices a few kilos of capacity compared with the NYX.
The iOptron HAE29 mount (shown here in "C" version with integrated options) illustrates the incredible compactness of this model - the head weighs just 3.7 kg. Despite its small size, the RA/DEC motor block in black anodized aluminum provides a stable base for medium-caliber tubes. Thanks to its ultra-light weight, it's a popular mount for nomads. The Sino-American manufacturer iOptron is well known in the field of equatorial mounts. With its long experience (CEM, GEM, iEQ, etc.), iOptron embraced the strain wave revolution in 2021 with the release of the HEM27 and HEM44, then expanded its range in 2022-2023 with the HAE ("Harmonic AZ/EQ") models, of which the HAE29 is one. The iOptron HAE29 is, in a way, a direct competitor to the ZWO AM5: same price range, similar load capacity (~13 kg without counterweight) and the vocation of a mount that can be transported without constraint. However, iOptron brings its technological flair and experience of GoTo mounts to the table to win over enthusiasts.
- Head weight: just 3.7 kg (8.15 lbs) all-in ! That's almost half the weight of the AM5N, and 40% less than the NYX-101. Suffice to say, it's disconcertingly light when you pick it up. At less than 4 kg, iOptron is clearly targeting nomadic astrophotographers for whom every kilo counts (plane, bivouac, etc.). Such a featherweight inevitably implies some compromises on component size, but iOptron seems to have optimized the structure to maintain adequate rigidity (machined aluminum alloy, short axes, etc.).
- Payload without counterweight: 13.5 kg (29.7 lbs) . That's a little under the AM5N's 15kg, and well under the NYX's 20kg, but still impressive given the mount's mass. In practice, 13.5 kg without counterweight already allow us to mount, for example, a Newton 200 mm f/4 + camera + guide (≈10-12 kg total) without worry, or a 120 mm refractor with all its accessories. The maximum load with counterweight is given for 18 kg by iOptron , thanks to the addition of an optional bar (20 mm) and weights. This can be useful if you want to exploit the mount to the limits in planetary imaging (heavy tube) or visual with a C11 for example . Nevertheless, the HAE29's philosophy is clearly "no counterweight" for most uses (<=13 kg).
- Tracking performance: the HAE29 uses harmonic reducers with ratios of 480:1 (RA) and 360:1 (DEC) , giving it an error period of around 360 seconds (6 minutes, close to the AM5). Without an additional encoder, its periodic error is comparable to that of its rivals (~±20″ estimated). In self-guidance, users report similar performance to the AM5: "guiding consistent at 0.5-0.8″ RMS... the HAE29 performs similarly" . In other words, correctly guided, a HAE29 can hold round stars at long exposures, within the limits imposed by turbulence and mechanics. Here again, autoguiding is mandatory beyond a few hundred mm focal length (like all these strain wave mounts) . iOptron offers an optional HAE29EC version with high-resolution encoder on the RA axis, making it possible to envisage tracking without autoguiding on short focal lengths (or significantly refined guiding). One astronomer reports, for example, "My HAE29EC is the most accurate mount I've used, I often use it without autoguiding down to 1.1″/pixel"  . However, this EC version significantly increases the price. The standard version, on the other hand, will require autoguiding at >~200 mm focal length like its competitors .
- Technology and construction: the HAE29 has an all-metal, black-anodized chassis, with a rather streamlined design. It features an electronic friction brake on both axes (RA and DEC) which acts like a safety clutch: in the event of a power cut, the mount stops without collapsing, and restarts tracking exactly where it left off thanks to a position memory. This power-down memory function is inherited from classic iOptron mounts, and avoids the need to re-align if the mount is restarted (handy for remote control or if you deliberately switch off for a break). The motorization uses harmonic-coupled stepper motors, with a classic Go2Nova controller. All iOptron firmware features are included: lunar/solar tracking, rollover limit adjustment, periodic error models, etc... This is a point often underlined in comparison: the AM5's firmware was considered "rudimentary" in these respects, whereas the HAE29 benefits from over 10 years' iOptron experience in the field. Finally, the mount incorporates the famous iPolar electronic polar viewfinder (optional on some kits, sometimes included depending on version)  . The iPolar is a small camera in the polar axis, connected to the PC, which enables fast and precise set-up via dedicated software - a real plus for beginners or mobiles without a visible polar or a stable place to install an optical viewfinder.
In terms of use, the HAE29 is distinguished by the fact that it can be delivered either with or without a snowshoe, depending on the part number. iOptron has designed the mount so that it can be controlled entirely via a computer (PC or Raspberry Pi) or via a cell phone without a snowshoe, but still offers the Go2Nova 8409 snowshoe as an option or included depending on the package. Many users attached to traditional snowshoes appreciate this option. The iOptron snowshoe provides access to a database of 212,000 objects and multi-star alignments for precise visual pointing. In addition, the mount has built-in Wi-Fi (but unlike Pegasus, the HAE29's Wi-Fi passes through the snowshoe or an add-on module, not a hotspot in the mount itself). In practice, this means that to use Wi-Fi or connect a PC via USB, you need to connect the snowshoe (which acts as a communications gateway). Some may see this as an inconvenience (one more cable and one more component), while others find it transparent. Note that iOptron has recently proposed an alternative: the iMate (optional), which is a mini-computer integrated into the mount, running Linux with KStars/Ekos. If you choose the HAE29 + iMate version, you get a stand-alone mount that you can pilot via VNC on your smartphone, for example - a sort of equivalent to the integrated ASIAIR. Clearly, iOptron aims to cover every conceivable application.
The HAE29's pointing mechanism is similar to that of the AM5: a latitude-adjustable base (0-90°) with knurled knobs and locking screws (here, to be tightened with an Allen key). On this point, some have noted that the AM5 is more convenient because 100% no tools are required to set and lock azimuth/latitude, whereas the HAE29 requires screws to be tightened (risk of play if incorrectly tightened in the dark). This is an ergonomic detail where ZWO has the advantage. On the other hand, the HAE29 directly offers something that the AM5 didn't initially have: an internal passage for connectors in the axis (or at least a partial one). In fact, the HAE29's RA axis is hollow, allowing its own cables to pass through ("cable management ready" according to iOptron), and the mount also incorporates safety stops to avoid collisions (limit sensors). In short, iOptron has capitalized on its previous mounts to make the HAE29 a complete package right from the start.
In the field, the HAE29 was convincing thanks to its extreme lightness and performance in line with expectations. Many HEM27 (previous model ~10 kg load) and AM5 owners chose the HAE29 to save even more weight. And they're not disappointed: "The big difference is the weight of the mount: AM5 5.5 kg vs. 3.7 kg HAE29" remarks one contributor, pointing out that the load capacity is virtually equivalent between the two. Another user on Reddit, who has used both frames, notes that "the HAE29 has better finishes (no plastic buttons, etc.)", which gives it a superior feel in hand. He also mentions that you have to go through a few configuration steps with the racquet that make installation "a little more complex" than with the AM5. In fact, starting up the HAE29 involves switching on the snowshoe, checking the zero position, and possibly aligning if you want to use the object database for visual purposes, whereas the AM5 connected to the ASIAIR only needs a GPS location and polar alignment to be operational. However, in purely PC-controlled mode, most of these steps can be bypassed (plate-solving replaces initial alignment). All you need to know is that the iOptron philosophy remains more "classic" in use, which some will appreciate (you can use it autonomously in the field just with your snowshoe, without a PC), and others less so (one more component, a hint of initial complexity).
In terms of load-bearing capacity, the HAE29 performs optimally up to ~10 kg without counterweight. Beyond that, we recommend adding a small counterweight to relieve the motors if you're aiming for absolute stability. A Cloudy Nights contributor recommends, for example, the AM5 or HAE29 for a 10 kg tube, but rather iOptron's big HEM44 if you need to go up to 12-13 kg of instrument. This is quite consistent with the logic: HAE29 to stay light up to a certain intermediate setup, then beyond that you change category. Fortunately, 10 kg of tube already covers the majority of amateur imaging setups (80-130 mm scopes, small 150-200 mm Newtons, SCT 8″ EdgeHD, etc.).
As for stability and tracking, users note that the HAE29 is surprisingly robust despite its mini-size. An important point is to manage the cables well (as always) and attach the mount to a suitable tripod. iOptron offers an optional LiteRoc 1.5″ tripod or 8″ column. Many use the column on a photo tripod or directly on a pier stand to gain compactness. The built-in bubble level helps with level alignment, and the iPolar makes alignment almost trivial even in daylight (you can align without seeing the North Star, via the software's astrometric resolution). This is an advantage for beginners: there's no need to contort yourself in a viewfinder, you can do everything on the PC screen. As one user put it: "iPolar is great, you don't need an optical viewfinder, even though the AM5 aligns well using astrometry via ASIAIR too" - in the end, everyone has their own method, the important thing is that the mount is not a limiting factor.
In short, the iOptron HAE29 is the most portable harmonic mount in this comparison. Its main selling point is a featherweight of just 3.7 kg, for a respectable capacity of 13.5 kg without counterweight. It benefits from the tried-and-tested iOptron ecosystem: GoTo racket included (depending on version), multi-star alignment, electronic polar finder, programmable tracking limits, etc. In other words, it will reassure those who want a complete "turnkey" mount while benefiting from strain wave technology. The counterpart to this wealth of functions is perhaps a slightly more technical approach to get to grips with (you need to familiarize yourself with iOptron logic, the racket, etc., although it's not rocket science). According to users who have directly compared the AM5 and HAE29, you can't really "go wrong" by choosing one or the other, as they offer comparable tracking performance. The choice is based on more subtle criteria: trusted brand, preferred ergonomics, etc. It's also worth noting that the HAE29 is often a little less expensive than the AM5N (depending on promotions, a ~200 chf difference in favor of iOptron by the end of 2023 according to some posts). In Europe, it can be found for around 2300 chf TTC (mount only with case, without tripod). This makes it an excellent value for money. If your objective is to have the lightest possible mount to carry on a plane or on an astro-tour, this is probably the best choice. You'll just have to check whether 13 kg is enough for you; if not, you'll have to consider the big sister HAE43 or... the beefier Pegasus NYX.
Here's a side-by-side summary of the main features (manufacturer/retailer data, last checked: July 17, 2025). Always check the product data sheet before buying.
| Features | ZWO AM5N | Pegasus Astro NYX-101 | iOptron HAE29 |
|---|---|---|---|
| Head weight | ~5.5 kg | ~6.4 kg (head) | carbon tripod ~2 kg | ~3.7 kg (with saddle) |
| Load without counterweight | 15 kg (33 lb) | 20 kg (44 lb) | 13.5 kg (29.7 lb) |
| Max. load with counterweight | ~20 kg (44 lb) | up to 30 kg (66 lb) with suitable tripod | ~18 kg (40 lb) |
| EQ / Alt-Az mode | Yes (0-90°) | Yes (0-90°) | Yes (dual AZ/EQ) |
| Power/USB ports on head | 12 V + USB on saddle | 12 V + USB2 input; power output via GX12 | 12 V power supply; USB / Wi-Fi via racket; internal cable routing (DIY) |
| Control | ASIAIR / appli / ASCOM ; no racket | Unity app; simultaneous Wi-Fi & USB; optional racket | Go2Nova racket; ASCOM / Commander; mobile app; iPolar |
| Special functions | Bluetooth; reinforced base; Heavy-Duty mode | RA brake; weather & orientation sensors; safety limit | RA/DEC friction brake; power-down memory; iPolar |
| Target audience | Integrated nomadic astrophoto ASIAIR | Heavy nomad setups / obs perso | Ultra-light travel; visual + mixed astrophoto |
Loads assume correct balancing and a suitable tripod. Tube length, wind load and use (visual vs. long exposure imaging) all have an impact on realistic loads.
The AM5N, NYX-101 and HAE29 harmonic mounts all represent high-performance solutions for nomadic astrophotography or light observatory work. The choice of the "best" will depend above all on your specific needs and priorities: maximum load capacity, minimum weight, budget, preferred software ecosystem, etc. Here are some final thoughts to guide your decision:
- For the "advanced beginner" amateur astrophotographer looking for a versatile, easy-to-use system, the ZWO AM5N often appears to be the best overall compromise. It benefits from a large user community (lots of feedback available), exemplary integration with ZWO solutions (notably ASIAIR), and now significant improvements in precision and ergonomics. Its 15 kg capacity without counterweight covers most setups up to a medium-sized telescope. What's more, its mid-range price makes it an attractive choice: you get an accomplished, immediately operational mount that has proved its worth in the field. As one conquered user put it: "Even with the release of competing mounts, I wouldn't let go of my AM5 for my current setup" . Barring specific needs not covered, the AM5N has what it takes to fully satisfy an ambitious astro-photographer wishing to take the step towards a harmonic mount.
- For the astrophotographer who already has heavy equipment, or who wants maximum room for manoeuvre, the Pegasus Astro NYX-101 is the premium mount capable of meeting challenges that others can't. This is the mount to choose if you plan to load up to ~20 kg without counterweight - for example, a large-diameter or highly-equipped telescope. It offers high-end build quality, innovative technological options (RA brake, integrated sensors) and excellent tracking once mastered. Admittedly, it represents a higher investment (the price of peace of mind, some would say), but if your configuration justifies it, it will repay you in reliability and performance. One user sums up his choice as follows: "The NYX 101 can do everything, from small setup to C11, it's in a class of its own. In short, for those who refuse the slightest compromise on capacity in this frame format, the NYX-101 is the best in this range before having to upgrade to even more expensive frames (RainbowAstro, etc.).
- For the hardcore nomadic astrophotographer obsessed with lightweight setup, the iOptron HAE29 is a hard choice to beat. Weighing in at just 3.7 kg, it's literally a mount you can take anywhere without a second thought. It's perfect for those who travel by plane to get under the starry skies, or who have to walk to set up their equipment. Despite its featherweight, it offers all the essential features thanks to the iOptron heritage (it really does feel like a big mount condensed into a small package). If your tubes won't exceed 10-12 kg in imaging configuration, the HAE29 will offer you a complete experience. What's more, for mixed visual/imaging use, the presence of a snowshoe and iPolar can make life easier: you can do PC-free observing whenever you like, or lend the mount to a beginner for assisted visuals, for example. As several people who have compared AM5 and HAE29 have noted, it's a close match: "you can't go wrong, both work very well". But if weight is your main criterion, the HAE29 has the edge, and you won't regret your choice.
In conclusion, "the best harmonic mount" among these three depends on your use: the AM5N shines for its balance and simplicity (a true best-seller that has democratized harmonic mounts), the NYX-101 for its power and level of finish (an exceptional mount for heavy configurations), and the HAE29 for its record lightness and reassuring classic functions (the choice of astute travelers). In any case, these mounts embody the future of portable astrophotography: no more counterweights and 20 kg mounts to assemble, welcome to the era of "mini-titans" capable of feats unimaginable just a few years ago. It's up to you to choose the one that will make your nights under the stars a real pleasure, with no backache and plenty of pictures to feast your eyes on!
Sources of feedback cited: Discussions on Webastro, Astrosurf, Cloudy Nights and Reddit, where many amateur astronomers share their opinions on these mounts, as well as official data sheets and detailed tests published by manufacturers or retailers. These cross-references have enabled us to verify each piece of technical information and to base this comparison on concrete facts. I hope this guide has enlightened you, and wish you many happy observations and photographs with the harmonic frame of your dreams! Clear skies!
Carlos
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