Telescope Comparison
StellaLyra 6" f/8 Planetary Dobsonian vs Ursa Major 6" f/8 Planetary Dobsonian
The specs are close. The experience isn't.
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First light
StellaLyra · 152mm · £349
The maximum-aperture visual reflector
- 152mm Newtonian on a floor-standing Dobsonian alt-az rocker box
- Good for: full visual programme — planets, Moon, globular clusters, galaxies, nebulae
- No alignment required — set up and observe in under 10 minutes
- No motorised tracking — targets drift at high magnification as Earth rotates
- 20.9kg total — designed for a fixed garden or regular dark-sky site, not casual transport
Ursa Major · 152mm · £269
The maximum-aperture visual reflector
- 152mm Newtonian on a floor-standing Dobsonian alt-az rocker box
- Good for: full visual programme — planets, Moon, globular clusters, galaxies, nebulae
- No alignment required — set up and observe in under 10 minutes
- No motorised tracking — targets drift at high magnification as Earth rotates
- 20.9kg total — designed for a fixed garden or regular dark-sky site, not casual transport
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Effectively equal light-gathering. Aperture won't settle this comparison — the mount, focal ratio, and observing experience are what differ.
Focal length
Same focal length — identical magnification with any given eyepiece. Differences come from optical design and coatings.
Focal ratio
Same focal ratio — the same eyepiece gives equivalent magnification and true field in both scopes.
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
Same optical design — differences between these scopes come from aperture, mount, and focal ratio.
At the eyepiece
Both scopes · same aperture
Both are 152mm Newtonian reflectors — light gathering is identical. What you see through each depends on your eyepieces, your sky, and the steadiness of the atmosphere, not which scope you bought. Saturn's rings separate clearly from the disk; in good seeing, the Cassini Division — the dark gap between the A and B rings — is a genuine target at moderate magnification. Jupiter shows two equatorial cloud bands reliably, four Galilean moons changing position night to night. The Orion Nebula (M42) shows real nebulosity around the Trapezium, which splits into four stars at moderate magnification. The Andromeda Galaxy (M31) fills a wide-field eyepiece, the bright core distinct from the outer halo. What separates these scopes is the mount, the setup experience, and where you can use them — not what you see through them.
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 — build quality and optical refinement — 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.
StellaLyra
StellaLyra 6" f/8 Planetary Dobsonian
Objects drift out of view at high magnification
There is no tracking. At high magnification, targets drift across the field as Earth rotates and require regular manual nudging to keep them centred.
Too large for spontaneous outings
At 20.9kg total, getting this scope to a dark-sky site requires planning and ideally a second pair of hands. It suits a fixed garden setup or a dedicated trip, not an impulsive clear-night dash.
Ursa Major
Ursa Major 6" f/8 Planetary Dobsonian
Objects drift out of view at high magnification
There is no tracking. At high magnification, targets drift across the field as Earth rotates and require regular manual nudging to keep them centred.
Too large for spontaneous outings
At 20.9kg total, getting this scope to a dark-sky site requires planning and ideally a second pair of hands. It suits a fixed garden setup or a dedicated trip, not an impulsive clear-night dash.
Which is right for you?
Two different buyers. Two different right answers.
The maximum-aperture visual reflector
StellaLyra · StellaLyra 6" f/8 Planetary Dobsonian
You’ll love this if…
- More aperture per pound is your main criterion — this design gives more light-gathering for your money than any other mount type at this price
- You plan to observe from a fixed garden or regular dark-sky site where you can set it up and leave it between sessions
- You prefer manual navigation — the Dobsonian rewards patient, hands-on observing and builds genuine sky knowledge over time
This will frustrate you if…
- You want to observe at high magnification without nudging the scope constantly — there is no tracking, and targets drift across the field as Earth rotates
- You want to take it to different locations easily — at this weight and size, it's a significant lift and benefits from a second pair of hands
- You want to take it out for spontaneous sessions — at this weight, getting it in and out of a car on your own requires planning and ideally a second pair of hands
The maximum-aperture visual reflector
Ursa Major · Ursa Major 6" f/8 Planetary Dobsonian
You’ll love this if…
- More aperture per pound is your main criterion — this design gives more light-gathering for your money than any other mount type at this price
- You plan to observe from a fixed garden or regular dark-sky site where you can set it up and leave it between sessions
- You prefer manual navigation — the Dobsonian rewards patient, hands-on observing and builds genuine sky knowledge over time
This will frustrate you if…
- You want to observe at high magnification without nudging the scope constantly — there is no tracking, and targets drift across the field as Earth rotates
- You want to take it to different locations easily — at this weight and size, it's a significant lift and benefits from a second pair of hands
- You want to take it out for spontaneous sessions — at this weight, getting it in and out of a car on your own requires planning and ideally a second pair of hands
Our verdict
Same aperture, same light-gathering, £80 price difference. The extra cost of the StellaLyra 6" f/8 Planetary Dobsonian buys a different mount — not better optics.
For most beginners, the Ursa Major 6" f/8 Planetary Dobsonian is the right starting point — the optics are identical and the savings are better spent on a quality eyepiece or a dark-sky trip. The StellaLyra 6" f/8 Planetary Dobsonian makes sense if the mount it comes with is specifically what you want to learn. If I had to choose: the Ursa Major 6" f/8 Planetary Dobsonian — same sky, less money.
StellaLyra 6" f/8 Planetary Dobsonian
View StellaLyra 6" f/8 Planetary Dobsonian →Ursa Major 6" f/8 Planetary Dobsonian
View Ursa Major 6" f/8 Planetary Dobsonian →Affiliate links — we earn from qualifying purchases at no extra cost to you.
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 | StellaLyra 6" f/8 Planetary Dobsonian | Ursa Major 6" f/8 Planetary Dobsonian |
|---|---|---|
Aperture The most important spec — bigger = more light = better views | 152mm | 152mm |
Focal Length Longer = more magnification potential | 1200mm | 1200mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/7.9 | f/7.9 |
Optical Design The type of optics — each design has different strengths | Dobsonian | Dobsonian |
How do you point it?
| Spec | StellaLyra 6" f/8 Planetary Dobsonian | Ursa Major 6" f/8 Planetary Dobsonian |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Dobsonian | Dobsonian |
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 | StellaLyra 6" f/8 Planetary Dobsonian | Ursa Major 6" f/8 Planetary Dobsonian |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 2" | 1.25" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | 2" dual-speed Crayford (10:1) | 1.25" CNC Crayford |
Size & weight
| Spec | StellaLyra 6" f/8 Planetary Dobsonian | Ursa Major 6" f/8 Planetary Dobsonian |
|---|---|---|
OTA Weight Optical tube only — useful for comparing mount load capacity | 9kg | 9kg |
Total Weight Full setup including mount — this is what you lug to the car | 20.9kg | 20.9kg |
Tube Length | 1100mm | 1100mm |
What's in the box?
| Spec | StellaLyra 6" f/8 Planetary Dobsonian | Ursa Major 6" f/8 Planetary Dobsonian |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 9mm and 15mm 1.25" Super-Plössl, 30mm 2" Superview | 9mm and 25mm 1.25" Super-Plössl |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | 6x30 right-angled | 6x30 straight-through |
Blue highlight: StellaLyra 6" f/8 Planetary Dobsonian advantage · Amber highlight: Ursa Major 6" f/8 Planetary Dobsonian advantage · Greyed cells: equal or subjective.