Telescope Comparison
Celestron StarSense Explorer LT 80AZ vs Omegon AC 102/660 AZ-3
The specs are close. The experience isn't.
First light
Celestron · 80mm · £159
The simple alt-az visual scope
- 80mm 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
- 5.8kg total — manageable to carry to dark-sky sites
Omegon · 102mm · £119
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
- 5.2kg total — manageable to carry to dark-sky sites
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Omegon AC 102/660 AZ-3 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 LT 80AZ's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Omegon AC 102/660 AZ-3's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Omegon AC 102/660 AZ-3's faster f/6.5 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Celestron StarSense Explorer LT 80AZ's f/11.25 provides more magnification per eyepiece — better for fine planetary detail.
Mount type
Same mount type — setup experience and ergonomics will be similar. Differences lie in build quality and included accessories.
Weight (OTA)
Similar optical tube weight. Any portability difference between these setups comes from the mount, not the tube itself.
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 LT 80AZ
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 longer focal ratio gives the sharp, high-contrast images that quality refractors are known for — planetary detail and pinpoint stars with a good eyepiece.
Omegon
Omegon AC 102/660 AZ-3
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 Omegon AC 102/660 AZ-3 gathers 1.6× more light than the Celestron StarSense Explorer LT 80AZ — 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.
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
Both scopes are solving a similar problem in a similar way. The differences are real — focal ratio and field of view — but these show up after several months of regular use, not on the first night. Pick the one whose design best matches how you actually plan to observe.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Celestron
Celestron StarSense Explorer LT 80AZ
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.
Omegon
Omegon AC 102/660 AZ-3
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.
Which is right for you?
Two different buyers. Two different right answers.
The simple alt-az visual scope
Celestron · Celestron StarSense Explorer LT 80AZ
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 simple alt-az visual scope
Omegon · Omegon AC 102/660 AZ-3
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
Our verdict
At similar price points, these scopes offer different amounts of aperture per pound. The Omegon AC 102/660 AZ-3 gives you more light-gathering for your money — and for visual observing, aperture per pound is the most useful single metric.
For pure optical value, the Omegon AC 102/660 AZ-3 is the stronger pick. The Celestron StarSense Explorer LT 80AZ compensates with other features — decide whether those trade-offs justify the premium. If I had to choose: the Omegon AC 102/660 AZ-3 — more aperture per pound means more sky.
Celestron StarSense Explorer LT 80AZ
View Celestron StarSense Explorer LT 80AZ →Omegon AC 102/660 AZ-3
View Omegon AC 102/660 AZ-3 →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 LT 80AZ | Omegon AC 102/660 AZ-3 |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 80mm | 102mm |
Focal Length Longer = more magnification potential | 900mm | 660mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/11.25 | f/6.5 |
Optical Design The type of optics — each design has different strengths | Refractor | Refractor |
Coatings Better coatings = more light transmission through the optics | Fully coated achromatic refractor optics | Fully multi-coated achromatic doublet |
How do you point it?
| Spec | Celestron StarSense Explorer LT 80AZ | Omegon AC 102/660 AZ-3 |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Alt-Az | Alt-Az |
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 LT 80AZ | Omegon AC 102/660 AZ-3 |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 1.25" | 1.25" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | Rack and pinion | Rack and pinion |
Size & weight
| Spec | Celestron StarSense Explorer LT 80AZ | Omegon AC 102/660 AZ-3 |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 2.1kg | 2.5kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 5.8kg | 5.2kg |
Tube Length | 900mm | 700mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Celestron StarSense Explorer LT 80AZ | Omegon AC 102/660 AZ-3 |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 25mm and 10mm eyepieces | 10mm and 25mm eyepieces |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | StarSense sky recognition dock (uses your smartphone) | 6x30 finder scope |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Celestron StarSense Explorer LT 80AZ advantage · Amber highlight: Omegon AC 102/660 AZ-3 advantage · Greyed cells: equal or subjective.