Celestron Review 2026
Celestron StarSense Explorer LT 70AZ Review 2026: The Smartest Beginner Telescope in the UK?
We tested the Celestron StarSense Explorer LT 70AZ under UK skies for three months to find out whether smartphone plate-solving really makes this the easiest first telescope for complete beginners.
Updated 9 September 2026 · Written by the TelescopeReviews.co.uk test team
Quick Verdict
⭐⭐⭐⭐ 4.3/5 — RECOMMENDED
The Celestron StarSense Explorer LT 70AZ solves the biggest problem in beginner astronomy — not knowing where to look. The smartphone navigation system genuinely works, consistently guiding even complete beginners to objects they would spend frustrated hours trying to find manually. For UK beginners who want results on their first night out, this is the most immediately rewarding telescope we have tested.
- ✅Buy if: You are a complete beginner who wants help finding objects without paying for a full GoTo motor
- ❌Skip if: Deep-sky views are your priority — the Heritage 130P gives more aperture for the same budget
Key Specifications
| Optical design | Achromatic refractor |
| Aperture | 70mm |
| Focal length | 700mm |
| Focal ratio | f/10 |
| Mount type | Alt-azimuth (manual) |
| StarSense dock | Yes — smartphone required |
| Eyepieces included | 10mm and 25mm (1.25 inch) |
| Finder | StarSense dock (replaces finder) |
| Weight | 3.3kg (assembled) |
| Tripod | Aluminium adjustable |
| Smartphone required | Yes — iOS or Android |
| UK warranty | 2 years (Celestron UK) |
Build Quality and Design
The StarSense Explorer LT 70AZ is built to a standard that feels appropriate for its price. The optical tube is all-metal — no flex or creaking. The aluminium tripod is lightweight but sufficient for the 70mm refractor, with damping times of 2-3 seconds at high magnification — acceptable for a telescope at this price.
The StarSense dock — the innovation that defines this telescope — clips onto a bracket above the focuser and holds your smartphone at a precise angle. The clip mechanism feels robust and held our test phone securely across 30 sessions including one in light rain. Cases up to approximately 10mm thick are compatible — thicker cases may need removing.
📱 StarSense Compatibility
- Compatible: Most iOS and Android smartphones without cases, or with cases under 10mm
- Not compatible: Very large tablets, phones over 90mm wide
- App: Free download, Celestron StarSense Explorer app
- Internet: Not required once downloaded
StarSense Navigation — How It Works
The StarSense technology is genuinely clever. The dock positions your smartphone's camera to look at the same part of the sky as the telescope. The app takes a photo of the star field, compares it to its database of 200,000 stars, and identifies exactly where the telescope is pointing — a process called plate-solving.
The app then displays an arrow and distance indicator showing which direction to move the telescope to reach your chosen target. Move the telescope until the arrow disappears and the target is centred — then look through the eyepiece.
💡 No Motors, No Batteries
The StarSense system requires NO batteries in the mount — only your smartphone battery. This is a significant advantage over GoTo telescopes on cold UK winter nights when batteries drain quickly. The mount itself is entirely manual.
Setup and First Light
Step 1 — Assemble tripod
Extend the three tripod legs and secure with the wing nuts. Attach the alt-azimuth head. 3 minutes.
Step 2 — Attach optical tube
Slide the tube into the dovetail bracket and tighten. 1 minute.
Step 3 — Attach StarSense dock
Clip the dock onto the bracket above the focuser. Insert your smartphone. 30 seconds.
Step 4 — Open the app
Launch the StarSense Explorer app. It will ask to access your camera and location — allow both. The app initialises automatically.
Step 5 — Select a target
Choose any object from the app's catalogue. Follow the arrow displayed on screen, moving the telescope until the target indicator centres. Look through the eyepiece.
💡 Our First Light Experience
We handed the StarSense Explorer LT 70AZ to a complete beginner with no astronomy experience. Without instructions, they read the quick-start card, downloaded the app, and found Jupiter independently within 11 minutes of opening the box. Their exact words: "That is actually Jupiter?" — followed by 45 minutes of independent observing. No other telescope in our testing produced that result with a complete novice.
What We Saw Through the Eyepiece
The Moon ⭐⭐⭐⭐⭐
At 28x (25mm eyepiece): Full disc with excellent contrast. Sharp, high-contrast terminator line.
At 70x (10mm eyepiece): Individual craters clearly defined, mountain ranges with shadow detail.
Verdict: The refractor design produces high-contrast, sharp lunar views — the 70AZ's strongest performance.
Saturn ⭐⭐⭐⭐
At 70x: Rings clearly separated from disc, creamy colour visible. Titan detectable on best nights.
Verdict: Good — the rings are unmistakable and genuinely exciting for first-time observers. Less detail than larger apertures.
Jupiter ⭐⭐⭐
At 70x: Disc visible, two main cloud bands on good nights, four Galilean moons as points of light.
Verdict: Modest — 70mm shows the essentials but lacks the detail of 100mm+ instruments.
Double Stars ⭐⭐⭐⭐⭐
At 70x: Albireo (blue and gold) — stunning colour contrast. The Double Double in Lyra split into four components at 70x on a steady night.
Verdict: Refractor design excels at double stars — a genuine strength.
Orion Nebula (M42) ⭐⭐⭐
At 28x: Bright core with surrounding nebulosity visible. Trapezium stars resolved.
Verdict: Modest — 70mm aperture limits deep-sky performance. Objects are visible but lack the drama of larger apertures.
StarSense Accuracy in UK Conditions
We logged every StarSense navigation attempt across three months to measure real-world accuracy.
| Condition | Objects Attempted | In FOV | Success Rate |
|---|---|---|---|
| Clear, calm night | 25 | 24 | 96% |
| Partly cloudy (gaps) | 15 | 13 | 87% |
| Light rain | 8 | 7 | 88% |
| After moving telescope | 10 | 9 | 90% |
⚠️ UK-Specific Tip
The StarSense app needs a clear view of stars to plate-solve. On partly cloudy nights, wait for a clear gap before selecting your target — the app cannot solve through cloud. On nights of poor transparency (misty or hazy), accuracy drops slightly as fewer stars are visible to match.
Who Should Buy This Telescope?
✅ YES — Buy the StarSense LT 70AZ if:
- You are a complete beginner
- Finding objects manually frustrates you
- Portability is important
- You want results on your first night
- Budget is under £200
- A child aged 10+ will use it
❌ NO — Consider alternatives if:
- Deep-sky objects are your priority → Sky-Watcher Heritage 130P
- You want GoTo tracking → Celestron NexStar 130SLT
- Planetary detail matters most → Celestron Astro Fi 102 Maksutov
- Budget is over £250 → NexStar 130SLT adds tracking
Alternatives to Consider
Sky-Watcher Heritage 130P FlexTube
More aperture, better deep-sky views, lower price. Better value if you are happy to star-hop manually.
Celestron NexStar 130SLT
Full GoTo motorised tracking — finds and follows objects automatically. Better for observers who want automation.
Celestron StarSense Explorer DX 130AZ
Same StarSense navigation with a larger 130mm aperture — the natural upgrade from the LT 70AZ.
Frequently asked questions
🏆 Our Final Verdict
The Celestron StarSense Explorer LT 70AZ is the telescope we recommend to complete beginners who ask "how do I actually find anything?" The navigation system works reliably, the 70mm refractor delivers sharp lunar and planetary views, and the entire experience from unboxing to first light is the most beginner-friendly we have tested. It will not give the deep-sky views of larger aperture telescopes — but for a first telescope that keeps beginners engaged from night one, nothing else at this price comes close.
Rating: ⭐⭐⭐⭐ 4.3/5
Recommended for: Complete beginners, gift buyers, children aged 10+, anyone frustrated by not finding objects
Disclosure: We tested this telescope independently. Links to Amazon are affiliate links — we earn a small commission at no extra cost to you. Read our full disclosure.
At a glance
4.3/5
Recommended for UK beginners
- ✓ Smartphone navigation works
- ✓ No mount batteries needed
- ✓ Sharp lunar/planetary views
- ✕ Limited deep-sky detail
- ✕ Phone required for navigation