1. Start from payload, not price
Rule of thumb: image at roughly 60–70% of the rated payload (mounts are rated for visual, not
imaging). A ~6 kg train wants a mount rated ~10 kg or more. Under-mounting a good scope is the most
common and most expensive mistake.
2. The options
- Star tracker: tiny, portable, for camera-lens and very short scopes. Outgrows quickly.
- German equatorial (GEM): the workhorse — counterweights, strong tracking, the most accessories
and support. Heavier to carry; needs balancing.
- Strain-wave / harmonic: little or no counterweight, high payload-to-weight, very portable —
excellent for travel — but typically relies on guiding and can show more high-frequency error.
| GEM | Strain-wave | |
|---|---|---|
| Portability | Lower (counterweights) | High |
| Guiding required | Often optional at short FL | Usually yes |
| Payload-to-weight | Lower | High |
| Ecosystem/support | Broadest | Growing |
3. For a ~6 kg imaging payload
A solid mid GEM rated ~10–13 kg is the safe, well-supported choice; a strain-wave mount of similar
rating wins if portability is your priority and you'll always guide. Either way, choose
guiding-capable (ST4 or pulse-guide) — you'll want it.
4. Budget tiers (confirm current models)
- Entry imaging GEM: ~10 kg class with guiding support.
- Mid: ~13 kg class GEM, or a comparable strain-wave for travel.
- Pair it with optics it can carry — see choosing a telescope.
A heads-up for later
All geared mounts have some reversal play; if tracking lags/jumps on direction changes, it's usually
tunable — see reducing mechanical play.
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How the mount works: what an equatorial mount does.
Common questions
What equatorial mount should I buy for astrophotography?
Size the mount to your imaging payload, not price — image at ~60–70% of the rated capacity. Choose between a German equatorial (GEM) and a strain-wave/harmonic mount based on portability and whether you'll always guide.
GEM vs strain-wave mount — which is better?
A GEM is the well-supported workhorse with counterweights; a strain-wave/harmonic mount gives high payload-to-weight and travel portability but usually relies on guiding. For ~6 kg, a mid GEM rated ~10–13 kg is the safe choice.