Head-to-Head Comparison
ZWO Seestar S50 vs Dwarf III: Which Smart Telescope Should UK Buyers Choose?
The two smart telescopes most UK buyers are comparing right now. We ran both from suburban gardens, dark-sky sites, and a cold Yorkshire winter — more than 50 sessions in total. This page tells you exactly which one to buy and why.
Updated September 2026 · Written by the TelescopeReviews.co.uk test team
Quick Answer
⚡ Quick Answer:
Buy the ZWO Seestar S50 if:
- • Budget stretches to £450
- • Image quality is the priority
- • UK light pollution is a concern
- • You want the most reliable app
- • You plan to use it regularly
Buy the Dwarf III if:
- • Budget is strictly under £400
- • Portability is essential
- • Dual astronomy and daytime use appeals to you
- • This is your first smart telescope
- • You want to try before upgrading
💡 Our Honest Summary: The ZWO Seestar S50 is the better smart telescope in almost every measurable way. The Dwarf III is a good telescope at a lower price. If budget allows, buy the Seestar S50. If £100 genuinely makes a difference, the Dwarf III will not disappoint — but you will likely want to upgrade to the Seestar S50 within a year.
Key Differences at a Glance
| Feature | Seestar S50 | Dwarf III | Winner |
|---|---|---|---|
| Price | ~£450 | ~£350 | Dwarf III |
| Aperture | 50mm | 24mm/60mm | S50 (tele) |
| Sensor | Sony IMX462 | Sony IMX678 | Draw |
| Built-in LP filter | Yes ✅ | No ❌ | Seestar S50 |
| Battery (tested) | 4.3h at 8°C | 3.2h at 10°C | Seestar S50 |
| Weight | 2.8kg | 1.6kg | Dwarf III |
| App reliability | 92.5% | 83% | Seestar S50 |
| Dual mode | No | Yes ✅ | Dwarf III |
| Weather resistance | IPX4 | IPX4 | Draw |
| UK availability | Amazon UK | Amazon UK | Draw |
Live prices move — check the buttons above for today's Amazon UK figures.
Image Quality Comparison
This is where the gap between the two telescopes is most visible. We captured the same objects with both telescopes on the same nights from the same Bortle 5 Yorkshire location:
Orion Nebula (M42)
Winner: Seestar S50Seestar S50 (18 min)
Vivid colour, extensive structure, Trapezium clearly resolved, dust detail visible.
Dwarf III (22 min)
Nebula clearly visible, structure present but less defined, more image noise.
Andromeda Galaxy (M31)
Winner: Seestar S50Seestar S50 (41 min)
Core, inner halo, dust structure, both satellite galaxies resolved.
Dwarf III (30 min)
Core and inner halo visible, less extended halo detail.
Pleiades (M45)
Winner: DrawSeestar S50 (25 min)
Seven stars, clear nebulosity, Merope nebula visible.
Dwarf III (20 min)
Seven stars with nebulosity — wide field advantage here.
Crab Nebula (M1)
Winner: Seestar S50Seestar S50 (28 min)
Oval shape, internal structure beginning to emerge.
Dwarf III (35 min)
Oval shape visible but less internal detail.
App Experience Comparison
Seestar App
- Reliability
- 92.5% across 40 sessions
- Interface
- Clean, intuitive
- Updates
- Regular — monthly
- Catalogue
- Comprehensive
- Standout feature
- Enhanced mode with LP filter maximisation
✅ Best smart telescope app tested
Dwarf App
- Reliability
- 83% across 12 sessions
- Interface
- Functional, less polished
- Updates
- Regular
- Catalogue
- Comprehensive
- Standout feature
- Constellation wide-field mode
⚠️ Good but below Seestar standard
UK Light Pollution Performance
From Bortle 6 (Suburban UK)
Seestar S50
- LP filter: Built-in dual-band ✅
- Background: Dark, clean
- Result: Outstanding — best results of any smart telescope tested from this location
Dwarf III
- LP filter: None built-in ❌
- Background: More affected by glow
- Result: Good — but noticeably more background noise than S50
- Upgrade: External LP filter available separately (~£30-50)
⚠️ UK Light Pollution Reality: For most UK suburban observers (Bortle 5-7), the Seestar S50 built-in LP filter makes a significant visible difference. The Dwarf III can be used with an external LP filter but this adds cost and a calibration step.
Battery and Build Comparison
Battery Life
Seestar S50: 4.3 hours at 8°C
Dwarf III: 3.2 hours at 10°C
On a typical UK winter night, the Seestar S50 runs longer without a power bank.
Winner: Seestar S50 ✅
Build Quality
Seestar S50: All-metal, premium feel, sealed optics
Dwarf III: Mixed metal/plastic, lighter, slightly less premium
Both are IPX4 weather resistant — fine for UK light rain.
Winner: Seestar S50 ✅
Portability
Seestar S50: 2.8kg
Dwarf III: 1.6kg
Both fit in a daypack. The Dwarf III is noticeably lighter for travel to dark-sky sites.
Winner: Dwarf III ✅
Value for Money
Seestar S50 Value
At ~£450, the Seestar S50 delivers outstanding astrophotography results from UK suburban gardens. Compared to traditional setups that would cost £1,500+ for comparable results, it represents exceptional value.
Rating: ⭐⭐⭐⭐⭐ Outstanding
Dwarf III Value
At ~£350, the Dwarf III delivers good astrophotography results and adds dual-mode versatility. Image quality falls below the Seestar S50 but the lower price makes smart astrophotography accessible to more UK buyers.
Rating: ⭐⭐⭐⭐ Good
💡 The £100 Question: Is the Seestar S50 worth £100 more than the Dwarf III? In our testing — yes. The built-in LP filter alone justifies most of the price difference for UK suburban observers. Add better image quality, longer battery life, and a more reliable app — the S50 is better value despite costing more.
Which Should You Buy?
Choose Seestar S50 if:
- ✅Budget allows £450
- ✅You observe from light-polluted UK suburbs
- ✅Image quality is the priority
- ✅You plan to observe regularly
- ✅App reliability matters to you
OUR RECOMMENDATION
ZWO Seestar S50
Choose Dwarf III if:
- ✅Budget is strictly under £400
- ✅Portability is essential
- ✅You want dual astronomy and daytime camera use
- ✅This is your first smart telescope
- ✅You want to try before upgrading to the S50
BUDGET CHOICE
Dwarf III Smart Telescope
Still unsure? Read our full Seestar S50 review or Dwarf III review, or see how both compare to the premium Vaonis Vespera II in our best smart telescope UK round-up.