When I compare equatorial mounts with belt drive systems, I look beyond the drive itself: setup tools, control options, payload, and what arrives in the box all affect how useful a mount will be. The Explore Scientific iEXOS-100-2 PMC-Eight is my pick for flexible app control and a processor-rich mount platform, while the MirroSky GX35 stands out for bundling a guide scope and imaging camera into a portable kit. Their key tradeoff is clear: the Explore Scientific offers a more open-ended tracker setup, whereas the GX35 supplies more imaging hardware but has a stated 22-pound payload limit and a specific power requirement. I rank them by how well their belt-driven design fits different observing and imaging plans—not by assuming that one mount suits everyone.
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Key Takeaways
- Choose the Explore Scientific iEXOS-100-2 if you want PMC-Eight control, tablet-based GoTo navigation, and clutched axes for balancing.
- Choose the MirroSky GX35 if the included 53mm ED guide scope and Sony IMX662 camera are more valuable to you than a bare mount platform.
- Both listings specify belt-driven stepper or synchronous-belt elements, but they describe different drive configurations; I would not treat the systems as identical.
- The GX35 has a stated 22-pound payload capacity, while no payload figure is supplied here for the iEXOS-100-2, so I would verify fit carefully before buying either for a heavy optical train.
- The iEXOS-100-2 includes a polar alignment sight hole rather than a polar scope; the GX35 requires a 12V, 3A supply.
| Explore Scientific iEXOS-100-2 PMC-Eight Equatorial Tracker System with Tripod |  | Best Overall for Flexible App-Controlled Tracking | Mount type: Equatorial | Control system: Explore Scientific PMC-Eight with eight independent CPUs | Drive: Dual-axis worm gears with belt-driven stepper motors | VIEW ON AMAZON | See Our Full Breakdown |
| MirroSky GX35 Smart EQ Mount with 53mm ED Guide Scope and Imaging Camera |  | Best Bundled Imaging Setup | Mount modes: Equatorial and Alt-AZ | Payload capacity: 22 lb (10 kg) | Mount weight: 8.8 lb (4 kg) | VIEW ON AMAZON | See Our Full Breakdown |
| equatorial mounts with belt drive system | Mount type | Control system | Drive | Connectivity |
|---|---|---|---|---|
| Explore Scientific iEXOS-100-2 | Equatorial | Explore Scientific PMC-Eight with eight independent CPUs | Dual-axis worm gears with belt-driven stepper motors | Wi-Fi and Bluetooth |
| MirroSky GX35 Smart EQ Mount w | — | — | — | — |
More Details on Our Top Picks
Explore Scientific iEXOS-100-2 PMC-Eight Equatorial Tracker System with Tripod
The iEXOS-100-2 earns my overall pick because its appeal is not limited to having belt-driven motors. It combines quiet belt-driven stepper motors with Explore Scientific’s PMC-Eight controller, described as using eight independent CPUs, and supports alignment and GoTo navigation through the ExploreStars app. That makes it the more attractive choice for a buyer who wants an app-controlled mount platform and expects to assemble a setup around it.
Its clutched axes are a useful practical distinction from the GX35 package: they let a buyer balance the telescope more precisely, rather than relying only on the bundled accessories to make a system ready. The mount also has a polar alignment sight hole, but that is not a polar scope. I would not treat the hole as equivalent to a dedicated optical polar scope, so buyers who want that type of aid should factor in their preferred alignment workflow.
Compared with the GX35, the Explore Scientific is less of an all-in-one imaging kit. The supplied details list no guide scope or imaging camera, while MirroSky includes both. In return, the iEXOS-100-2 provides Wi-Fi and Bluetooth connectivity and app support across Apple, Android, and Windows tablets; the GX35 app is listed for iOS and Android only. The listing gives no payload capacity, so I would confirm the mount’s supported load and compatibility for a chosen optical train rather than infer them from the drive system.
This is the stronger match if I want to prioritize controller features, balancing, and broad tablet compatibility. It is a weaker fit for someone who wants guiding hardware ready in the box or expects a dedicated polar scope as part of setup. Those limits keep it from being an automatic choice for every imaging build, even though its control package gives it the broadest role in this two-mount comparison.
Pros:- PMC-Eight control system is specified with eight independent CPUs.
- Quiet belt-driven stepper motors support app-based tracking and navigation.
- ExploreStars supports alignment and GoTo from Apple, Android, and Windows tablets.
- Clutched axes help with precise balancing.
Cons:- The provided polar alignment feature is a sight hole, not a polar scope.
- No focuser, guide scope, or imaging camera is listed in the supplied details.
- The supplied specifications do not state a payload capacity.
Best for: Buyers who want a belt-driven equatorial tracker with PMC-Eight control, tablet-based GoTo navigation, and clutched axes for balancing.
Not ideal for: Buyers who need a bundled guide scope and imaging camera, a dedicated polar scope, or a clearly stated payload rating before choosing.
- Mount type:Equatorial
- Control system:Explore Scientific PMC-Eight with eight independent CPUs
- Drive:Dual-axis worm gears with belt-driven stepper motors
- Connectivity:Wi-Fi and Bluetooth
- App and device support:ExploreStars; Apple, Android, and Windows tablets
- Alignment and balancing:Polar alignment sight hole; clutched axes
- Focuser:No focuser
- Model number:ES-iEXOS-100-02
Our verdict“I would choose the iEXOS-100-2 for its PMC-Eight controls and flexible tablet support, provided its load capacity suits the intended setup.”
MirroSky GX35 Smart EQ Mount with 53mm ED Guide Scope and Imaging Camera
The GX35 takes the second spot because its strongest advantage is a generous bundle, not simply its belt drive. Alongside the equatorial and Alt-AZ mount, it includes a 53mm ED guide scope and a Sony IMX662 imaging camera. For a buyer building a guided setup from scratch, those parts can make this a more direct route into imaging than the iEXOS-100-2, which is presented as a mount-and-tripod system without comparable imaging accessories.
Its drive specification is also more explicit about its components: an RA worm gear with 144 teeth and synchronous belt drives. The listed 22-pound capacity gives buyers a figure to compare against the telescope and imaging train, though I would leave room for accessories rather than plan right up to the stated limit. The mount itself weighs 8.8 pounds, which helps explain its portable positioning; that weight does not mean every telescope within the capacity will make an easy travel setup.
The main compromise is that the GX35 ties its value closely to the supplied guide scope and camera. If I already own suitable guiding and imaging components, some of the bundle may be less useful than the iEXOS-100-2’s tablet compatibility and PMC-Eight controls. MirroSky’s app is listed for iOS and Android, while ExploreStars also supports Windows tablets. The GX35 also requires a 12V, 3A power input, a concrete planning detail for field use that should not be overlooked.
I would select the GX35 when I want a portable, camera-equipped package that can operate in equatorial or Alt-AZ mode. I would skip it if my optical train is likely to exceed its stated capacity, if I need a wider device ecosystem, or if I already own the included imaging hardware and would rather prioritize controller flexibility. Compared with the Explore Scientific, it offers more imaging equipment upfront but fewer listed control-system details.
Pros:- Includes a 53mm ED guide scope and Sony IMX662 camera.
- Supports equatorial and Alt-AZ mount modes.
- The mount weighs 8.8 pounds and has a stated 22-pound payload capacity.
- Includes counterweight, shaft, power supply, and connecting cables.
Cons:- The 22-pound payload capacity limits heavier telescope and imaging combinations.
- Requires a 12V, 3A power input.
- App compatibility is listed for iOS and Android, not Windows tablets.
Best for: Buyers starting a portable imaging setup who want a guide scope and camera included, plus both equatorial and Alt-AZ operation.
Not ideal for: Buyers with a heavy imaging train, those who need Windows tablet app support, or owners who already have suitable guiding and imaging gear.
- Mount modes:Equatorial and Alt-AZ
- Payload capacity:22 lb (10 kg)
- Mount weight:8.8 lb (4 kg)
- Drive system:RA worm gear with 144 teeth and synchronous belt drives
- Guide scope:53mm ED
- Camera:Sony IMX662 CMOS, 2.1 MP, 1/2.8-inch sensor
- Power input:12V, 3A recommended
- App compatibility:iOS and Android
- Included accessories:Power supply, cables, 4 lb counterweight and shaft
Our verdict“I would choose the GX35 for its bundled guiding and imaging hardware, as long as the setup stays within its payload limit and has the required power.”
How We Picked
I focused this comparison on the practical reasons to choose an equatorial mount with belt-drive components: control, setup, stated load capacity, portability, and whether useful guiding or imaging hardware is included. A belt drive may contribute to quieter operation and smooth motor movement, but it does not by itself tell me how suitable a mount is for a particular telescope, camera, or exposure plan.
I gave the iEXOS-100-2 credit for its PMC-Eight system, app-based alignment and GoTo navigation, clutched axes, and stated belt-driven stepper motors. I also counted its sight-hole approach to polar alignment as a limitation for buyers who want a dedicated polar scope. The product details do not give a payload figure, so I avoid ranking it on load capacity.
For the GX35, I weighed its 22-pound capacity, 8.8-pound mount weight, dual operating modes, and bundled 53mm ED guide scope and IMX662 camera. Those accessories make it the more ready-to-build imaging package here, though the stated power input and capacity set boundaries. I ranked the products by distinct buyer needs rather than declaring a universal winner: flexible mount control first, bundled imaging hardware second.
Both options are judged from the supplied product information, not from hands-on testing. I recommend checking current compatibility details, included accessories, and support information before choosing, particularly if your telescope and imaging gear approach a mount’s stated capacity.
Factors to Consider When Choosing Equatorial Mounts With Belt Drive Systems
I would choose between these two by matching the complete setup—not just the motor—to the way I plan to observe or image. The iEXOS-100-2 prioritizes controller features and tablet options; the GX35 prioritizes bundled guiding and imaging parts. These differences matter more than treating the words “belt drive” as a guarantee of identical performance.
Understand What the Belt-Drive Listing Actually Says
The iEXOS-100-2 is described as using dual-axis worm gears with belt-driven stepper motors. The GX35 lists an RA worm gear with 144 teeth and synchronous belt drives. Those descriptions identify the drive components, but the provided information does not give comparative tracking-error measurements or a shared performance test. I would use the belt-drive details to identify the type of system, not to assume one will track more accurately than the other.
Quiet operation is explicitly listed for the Explore Scientific’s stepper motors. For the GX35, the supplied specification emphasizes its RA gear and belt arrangement instead. If quiet motor movement is a deciding factor, that claim is clearer for the iEXOS-100-2; if the stated gear details matter more, the GX35 spells them out.
Match Payload to the Whole Imaging Train
Count the telescope, camera, adapters, guide equipment, and other mounted accessories when judging capacity. The GX35 has a stated 22-pound limit, which gives a useful boundary but still calls for a sensible margin. A near-capacity setup can be less forgiving than a lighter one, especially when the rig includes several accessories.
The supplied iEXOS-100-2 information does not state a payload figure. I would not fill that gap by guessing from its name or from comparisons with other mounts. Before choosing it for a particular telescope, confirm the supported load from current product documentation. This is a key difference: MirroSky publishes a number here, while Explore Scientific’s details in this comparison do not.
Decide Whether a Bundle Saves You Work
The GX35 includes a 53mm ED guide scope and Sony IMX662 camera, along with a counterweight, power supply, and cables. That makes its package more appealing to a buyer who needs those components and wants fewer separate compatibility decisions. It is less compelling if I already own equivalent gear or want to choose each imaging component independently.
The iEXOS-100-2 comes across as a mount-and-tripod platform with control features rather than a complete guiding kit. That can suit buyers who already have accessories or prefer a different camera and guide scope. Neither approach is automatically better: I would compare the included parts with what I own and what I intend to add.
Compare Control and Alignment Needs
The Explore Scientific system has the broader listed tablet range: its ExploreStars app supports Apple, Android, and Windows tablets, with Wi-Fi and Bluetooth connectivity. It also specifies PMC-Eight control and clutched axes for balancing. The GX35 app is listed for iOS and Android and offers control and monitoring. If Windows tablet support or the named controller system matters to me, the iEXOS-100-2 is the clearer fit.
For polar alignment, the iEXOS-100-2 has a sight hole but no polar scope according to the supplied details. Buyers who prefer a dedicated optical aid should plan around that limitation. The GX35’s provided description does not specify a polar scope or equivalent alignment aid, so I would verify its alignment procedure rather than assume it includes one.
Plan for Power and Portability
The GX35’s 8.8-pound mount weight supports its portable appeal, and the included power supply and cables help establish what comes with the kit. Its specified 12V, 3A input still matters: I would check that a field battery or other power source can provide the required output. A light mount is only convenient away from home if the rest of the setup and power plan are manageable.
The supplied iEXOS-100-2 details do not give a mount weight or power requirement, so I would confirm both if transport and remote use are central to the purchase. Here, the GX35 has more concrete portability and power information, while the Explore Scientific description offers more detail about controller connectivity.
Frequently Asked Questions
Which of these mounts is the better pick for a beginner in astrophotography?
I would lean toward the MirroSky GX35 if the buyer needs a guide scope and camera, since both are included along with cables and a power supply. That bundle reduces the number of separate components to source. A beginner who values wider tablet support and the PMC-Eight control system may prefer the iEXOS-100-2, but should plan for guiding equipment separately and confirm payload compatibility.
Does a belt drive automatically mean more accurate tracking?
No. A belt-drive description tells me about part of the drive arrangement, not a complete tracking-accuracy result. These listings describe different systems, and neither supplied specification set gives a directly comparable tracking-error measurement. I would weigh the full mount design, rated capacity, setup, alignment, and current technical documentation rather than choose on the belt-drive label alone.
Which mount includes more equipment for imaging?
The GX35 includes more imaging-specific hardware in the supplied details: a 53mm ED guide scope and a Sony IMX662 camera, plus a counterweight, power supply, and cables. The Explore Scientific iEXOS-100-2 listing focuses on the mount, tripod, control system, and app features, with no guide scope or imaging camera specified. The GX35 bundle is most useful when those included items match the buyer’s plans.
Can I use the GX35 with a telescope weighing 22 pounds?
The stated 22-pound payload capacity is the mount’s listed limit, but I would count the complete mounted load, not only the telescope tube. Cameras, adapters, guide equipment, and other accessories add weight. I would leave practical headroom and confirm how the manufacturer defines capacity before planning a system near that figure.
Does the Explore Scientific iEXOS-100-2 include a polar scope?
No polar scope is listed in the supplied details. The iEXOS-100-2 has a polar alignment sight hole, which should not be confused with a dedicated polar scope. If a polar scope is part of the desired setup, I would check whether a compatible accessory is available and how the mount’s current alignment instructions address the omission.
Conclusion
I would pick the Explore Scientific iEXOS-100-2 if I wanted PMC-Eight control, clutched axes, and app support across Apple, Android, and Windows tablets, and I was comfortable arranging guiding equipment separately. I would pick the MirroSky GX35 if a 53mm ED guide scope and IMX662 camera make a ready-to-build imaging bundle more useful, provided my full load stays within its 22-pound capacity and my power source supplies 12V, 3A. For either mount, I would verify capacity, accessory compatibility, and alignment details against my intended setup before committing. The best choice is the one whose belt-driven design and included features fit the complete rig—not simply the one with the longer feature list.
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