Telescope Comparison
Celestron StarSense Explorer DX 102AZ vs Explore Scientific ED80 Essential
The Celestron StarSense Explorer DX 102AZ is a complete setup. The Explore Scientific ED80 Essential needs a mount before it's usable.
First light
Celestron · 102mm · £229
The simple alt-az visual scope
- 102mm refractor on a simple alt-az mount
- Good for: Moon, planets, bright open clusters
- No alignment required — quick to set up, intuitive to move
- Finding objects requires learning to star-hop: navigate with a finder scope and sky chart
- 7.5kg total — manageable to carry to dark-sky sites
Explore Scientific · 80mm · £249
The custom-rig optical tube
- 80mm refractor — optical tube only, no mount included
- 480mm focal length at f/6
- Requires a compatible mount before you can observe anything
- Best for: observers who already own a suitable mount or are building a specific imaging rig
- Not a complete purchase — budget at least £100–300 extra for a mount before observing
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Celestron StarSense Explorer DX 102AZ gathers 1.6× more light. On bright targets — Moon, Saturn, Jupiter — you won't notice. On fainter targets — dim galaxies, faint globular clusters — the gap is real.
Focal length
Celestron StarSense Explorer DX 102AZ's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Explore Scientific ED80 Essential's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Explore Scientific ED80 Essential's faster f/6 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Celestron StarSense Explorer DX 102AZ's f/6.47 provides more magnification per eyepiece — better for fine planetary detail.
Mount type
Explore Scientific ED80 Essential has no mount — add a compatible mount before you can observe. Celestron StarSense Explorer DX 102AZ is a complete ready-to-use system.
Weight (OTA)
Explore Scientific ED80 Essential's optical tube is 1.3kg lighter. Relevant if you plan to use it on multiple mounts or carry the tube to dark-sky sites separately.
Optical design
Both are refractors — no mirrors to collimate, good contrast, colour-free stars with ED or APO glass. The differences between them are in aperture, focal ratio, and glass quality.
At the eyepiece
Celestron
Celestron StarSense Explorer DX 102AZ
The Moon fills the field at low power with more detail than you'll have time to explore on any given night. Saturn's rings are unmistakable from the first session; in good seeing, the Cassini Division — the dark gap between the A and B rings — is a genuine target at higher magnification. Jupiter shows two equatorial cloud bands clearly, the four Galilean moons changing position night to night. The Orion Nebula (M42) shows clear structure — nebulosity spreading around the Trapezium, which splits at moderate power. The Andromeda Galaxy (M31) shows a concentrated core clearly. The Hercules Cluster (M13) shows some resolution at the edges at higher magnification. The fast focal ratio delivers wide fields — good for large nebulae and extended star fields. The Celestron StarSense Explorer DX 102AZ gathers 1.6× more light than the Explore Scientific ED80 Essential — a difference that's marginal on bright targets but visible on fainter ones: dimmer galaxies, faint globular clusters, and extended nebulosity that sits below the threshold of the smaller aperture.
Explore Scientific
Explore Scientific ED80 Essential
At moderate magnification, Saturn's rings are cleanly separated from the disk. Jupiter shows two equatorial cloud bands and four Galilean moons. The Moon rewards extended sessions at the eyepiece — the terminator is full of crater and highland detail. The Orion Nebula (M42) is bright and structured, the Trapezium straightforward to split. Open clusters are excellent — the Pleiades, the Double Cluster in Perseus, M35 in Gemini. The Andromeda Galaxy (M31) shows a clear bright core. The fast focal ratio delivers wide fields — good for large nebulae and extended star fields.
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
The Celestron StarSense Explorer DX 102AZ is a complete package — everything arrives in one box and you can observe the same day. The Explore Scientific ED80 Essential is a bare optical tube that needs a separate compatible mount before you can point it at anything, adding significant cost and complexity. Unless you already own a suitable mount, the Celestron StarSense Explorer DX 102AZ is the practical choice.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Celestron
Celestron StarSense Explorer DX 102AZ
Finding faint objects from a light-polluted garden is genuinely hard
Star-hopping to a globular cluster or dim galaxy from a suburban sky requires learning. Users report a real demoralising phase in the first weeks — landing on the wrong star field, convincing yourself it's the target, then finding out later it wasn't. This improves rapidly with experience.
Explore Scientific
Explore Scientific ED80 Essential
No mount included
You cannot observe until you buy a separate compatible mount — add at least £100–300 before you have a working telescope.
Nothing to look through on day one
Until a mount arrives, the optical tube is a piece of glass you cannot point at the sky.
Which is right for you?
Two different buyers. Two different right answers.
The simple alt-az visual scope
Celestron · Celestron StarSense Explorer DX 102AZ
You’ll love this if…
- You want the fastest possible setup — no alignment, no polar alignment, just point and look
- Learning the sky by star-hopping feels like part of the appeal, not a barrier to it
- Portability matters — this mount is manageable to carry to a dark-sky site without a car full of equipment
This will frustrate you if…
- You try to find faint objects from a light-polluted garden and mostly fail — users report a real demoralising phase in the first weeks of star-hopping that improves quickly but is genuinely discouraging at the start
The custom-rig optical tube
Explore Scientific · Explore Scientific ED80 Essential
You’ll love this if…
- You already own a compatible equatorial or alt-az mount — this is the optical tube you've specifically chosen to put on it
- You're building an imaging rig piece by piece and know exactly what you need at the end of a focuser
- Choosing an optical tube independently of the mount gives you more flexibility over your overall system
This will frustrate you if…
- You buy it without fully accounting for the mount — add at least £100–300 to the purchase price before you have a working telescope
- You expected a complete package and didn't realise this is a bare optical tube that cannot be used without a separate mount
Our verdict
This comparison has a catch: the Explore Scientific ED80 Essential is a bare optical tube. You cannot use it without a separate mount — which adds meaningful cost and complexity. The Celestron StarSense Explorer DX 102AZ is a complete, ready-to-observe package.
For most buyers, the Celestron StarSense Explorer DX 102AZ is the right choice — you can observe the same night it arrives. The Explore Scientific ED80 Essential makes sense if you already own a compatible mount, or are deliberately building a specific imaging setup piece by piece. If I had to choose for a first telescope: the Celestron StarSense Explorer DX 102AZ, without hesitation.
Celestron StarSense Explorer DX 102AZ
View Celestron StarSense Explorer DX 102AZ →Explore Scientific ED80 Essential
View Explore Scientific ED80 Essential →Deep field: Full specifications
Every data point, for those who want to go further.
Full specifications
Fields highlighted in blue or amber indicate the better value for that spec. Data is manufacturer-stated and may vary.
How much can it see?
| Spec | Celestron StarSense Explorer DX 102AZ | Explore Scientific ED80 Essential |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 102mm | 80mm |
Focal Length Longer = more magnification potential | 660mm | 480mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/6.47 | f/6 |
Optical Design The type of optics — each design has different strengths | Refractor | Refractor |
Coatings Better coatings = more light transmission through the optics | Fully multi-coated achromatic refractor | Fully multi-coated ED doublet (FCD-1 glass) |
How do you point it?
| Spec | Celestron StarSense Explorer DX 102AZ | Explore Scientific ED80 Essential |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Alt-Az | None (OTA only) |
GoTo Computer-controlled pointing — finds any of thousands of objects automatically | ||
Tracking Motor keeps objects centred as the Earth rotates — essential for astrophotography |
The focuser
| Spec | Celestron StarSense Explorer DX 102AZ | Explore Scientific ED80 Essential |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 1.25" | 2" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | Rack and pinion | 2-inch dual-speed Crayford |
Size & weight
| Spec | Celestron StarSense Explorer DX 102AZ | Explore Scientific ED80 Essential |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 3.2kg | 1.9kg |
Total Weight Full setup including mount — this is what you lug to the car | 7.5kg | — |
Tube Length | 660mm | 410mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Celestron StarSense Explorer DX 102AZ | Explore Scientific ED80 Essential |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 25mm and 10mm Kellner | — |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | StarSense sky recognition dock (uses your smartphone) | — |
Diagonalⓘ Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Celestron StarSense Explorer DX 102AZ advantage · Amber highlight: Explore Scientific ED80 Essential advantage · Greyed cells: equal or subjective.