Buying Guide
A Guide To Mounts
Ask any experienced astrophotographer what the most important piece of equipment is, and almost all of them will say the same thing: the mount. Not the telescope. Not the camera. The mount. This guide explains why, and how to choose the right one for your budget and goals.
In this guide
1. Why the Mount Matters More Than the Telescope
In visual astronomy, the telescope is everything. Aperture determines what you can see. Astrophotography works differently. You're taking long exposures of a few seconds to many minutes, stacking dozens or hundreds of frames to pull faint light out of the noise.
During those exposures, the mount has one job: track the stars perfectly as they drift across the sky due to Earth's rotation. Any vibration, any periodic error, any slight mis-tracking shows up as streaked stars in your images. A great camera on a bad mount will produce blurry, elongated stars every single time. A modest camera on a great mount will produce round, pinpoint stars.
2. Alt-Az vs. Equatorial Mounts
There are two fundamental mount types, and for astrophotography they are not equally suitable.
Alt-az (altitude-azimuth) mounts move in two directions: up/down and left/right. This feels natural and most consumer GoTo mounts sold for visual astronomy are alt-az. The problem for astrophotography is field rotation: as the sky tracks overhead, objects slowly rotate in your camera's field of view. At short exposures in wide-field setups this can be tolerable with de-rotation software, but in practice alt-az mounts are unsuitable for serious deep-sky imaging.
Equatorial (EQ) mounts have one axis aligned with Earth's rotation axis (the polar axis). When you polar align correctly, rotating that single axis compensates perfectly for Earth's rotation. No field rotation, no streaking. This is the only mount type that works reliably for deep-sky astrophotography.
| Feature | Alt-Az | Equatorial |
|---|---|---|
| Setup complexity | Simple — just level it | Requires polar alignment (~5 min) |
| Field rotation | ✗ | ✓ |
| Long exposures (>60s) | ✗ | ✓ |
| Visual astronomy | ✓ | ✓ |
| Portability | Generally lighter | Heavier counterweight system |
3. GoTo vs. Manual Tracking
Within equatorial mounts, you have a further choice: motor-driven GoTo or manual.
Manual EQ mounts have no motors; you push the telescope by hand. They cannot track the sky and are not useful for exposures longer than a few seconds. Good for visual astronomy on a budget; not recommended for imaging.
Motor-driven EQ mounts (non-GoTo) have a single motor on the right ascension axis only. They track the sky at sidereal rate, enabling longer exposures, but can't automatically point at objects. Increasingly rare.
GoTo EQ mounts have motors on both axes, a hand controller or WiFi app, and a database of tens of thousands of objects. After a brief alignment procedure, the mount slews automatically to any target. For astrophotography this is the practical standard. Dual-axis motors also enable autoguiding, which dramatically improves tracking accuracy.
4. Payload Capacity: The 50% Rule
Every mount has an advertised payload capacity — for example, "15 kg payload." This is the theoretical maximum under ideal, laboratory conditions. For imaging, use no more than 50% of the rated capacity. Three reasons:
- Tracking accuracy degrades near the limit. Gear train stress, flexure, and periodic error all get worse as you approach max load.
- Your "scope weight" is heavier than you think. Include the telescope, camera, guidescope, guide camera, focuser, filter wheel, dew heater, and all mounting hardware. A refractor listed at "3.8 kg" can become 7+ kg in a fully kitted imaging rig.
- Safety margin for wind, vibration, and uneven balance. Outdoor conditions are not lab conditions.
5. Mount Tiers: Budget, Mid-Range, and Advanced
Sky-Watcher EQM-35 class
Entry-level equatorial mounts with basic GoTo motor tracking. The EQM-35 is the most accessible option for beginner astrophotographers.
- Payload: ~6 kg rated (use max 3 kg for imaging)
- Best for: Small refractors up to ~600mm focal length, kit DSLRs
- Limitations: Marginal tracking accuracy, limited autoguiding performance
- Verdict: Gets you started. Expect to upgrade within 1–2 years if you get serious.
Sky-Watcher HEQ5 Pro Synscan
The most recommended first "serious" astrophotography mount. The community workhorse for over a decade, well supported by EQMOD, N.I.N.A., and Stellarium.
- Payload: 15 kg rated (use max ~7 kg for imaging)
- Best for: Short APO refractors 600–750mm, ZWO ASI cameras
- Autoguiding: Excellent ST-4 and ASCOM support. Can achieve <1" RMS.
- Verdict: Best value in astrophotography mounts. Many experienced imagers keep this for years.
Sky-Watcher EQ6-R Pro / iOptron CEM25P
For larger telescopes, heavier imaging trains, or demanding targets that need exceptional tracking.
- Payload: 20–25 kg rated (use max 10–12 kg for imaging)
- Best for: Larger scopes 750–1,500mm focal length, dual-rig setups
- Features: Belt-drive on EQ6-R eliminates periodic error almost entirely.
- Verdict: Buy this if you already have a heavy telescope or know you're buying one.
Star Trackers (Ultra-Portable Wide-Field)
The Sky-Watcher Star Adventurer 2i and iOptron SkyGuider Pro are compact trackers that compensate for Earth's rotation without a full equatorial mount. No GoTo, ~5 kg payload limit. Excellent for wide-field Milky Way and nightscape photography with a DSLR and short lens, but not suitable for telescopes or focal lengths above ~200mm.
6. The Harmonic Drive Revolution
7. Quick Summary
| Your situation | Recommendation |
|---|---|
| Total beginner, very tight budget | EQM-35 GoTo (~€300). Small refractor + kit camera only. |
| First serious astrophotography mount | HEQ5 Pro Synscan (~€600). The community standard. |
| Have a heavy scope (>4 kg tube) | EQ6-R Pro (~€1,000) or CEM25P (~€900) |
| Travel / wide-field Milky Way only | Star Adventurer 2i (~€250). No telescope. |
| Cutting-edge, willing to pay | ZWO AM5 or Pegasus NYX-101 (~€1,500+) |
The single most important skill to learn: polar alignment. Even a mid-range HEQ5 produces stunning images with precise polar alignment. Even an expensive EQ6-R will produce streaked stars with bad polar alignment. Use SharpCap, PoleMaster, or the ASIAIR's built-in routine and spend 5–10 minutes getting it right every session. It's the single biggest lever on image quality.
Not sure which mount fits your telescope and camera?
Tell our Gear Finder your setup — focal length, camera weight, goals — and it will match you with the right mount, warn you about payload overloading, and show compatible accessories.
Open the Gear Finder →