Telescope Comparison
StellaLyra 10" f/5 Dobsonian vs StellaLyra 12" f/5 Dobsonian
The specs are close. The experience isn't.
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First light
StellaLyra · 254mm · £619
The maximum-aperture visual reflector
- 254mm 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
- 31.5kg total — designed for a fixed garden or regular dark-sky site, not casual transport
StellaLyra · 304mm · £879
The maximum-aperture visual reflector
- 304mm 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
- 39.5kg 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
StellaLyra 12" f/5 Dobsonian gathers 1.4× 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
StellaLyra 12" f/5 Dobsonian's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. StellaLyra 10" f/5 Dobsonian's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
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)
StellaLyra 10" f/5 Dobsonian's optical tube is 4.0kg lighter. Relevant if you plan to use it on multiple mounts or carry the tube to dark-sky sites separately.
Optical design
Same optical design — differences between these scopes come from aperture, mount, and focal ratio.
At the eyepiece
StellaLyra
StellaLyra 10" f/5 Dobsonian
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 wide nebulosity with the Trapezium splitting cleanly into four points at 80×. The Hercules Cluster (M13) begins to resolve into individual stars at the outer edges at higher magnification. The Andromeda Galaxy (M31) fills a wide-field eyepiece; the bright core and inner disc are obvious, and on a dark night the dust lane becomes visible with careful looking.
StellaLyra
StellaLyra 12" f/5 Dobsonian
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 wide nebulosity with the Trapezium splitting cleanly into four points at 80×. The Hercules Cluster (M13) begins to resolve into individual stars at the outer edges at higher magnification. The Andromeda Galaxy (M31) fills a wide-field eyepiece; the bright core and inner disc are obvious, and on a dark night the dust lane becomes visible with careful looking.
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
The StellaLyra 12" f/5 Dobsonian costs 42% more. It delivers 50mm more aperture — a real and visible advantage on faint targets. For a first telescope, the StellaLyra 10" f/5 Dobsonian is the smarter entry point. Return to the StellaLyra 12" f/5 Dobsonian when you know from experience what you actually need.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
StellaLyra
StellaLyra 10" f/5 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 31.5kg 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.
StellaLyra
StellaLyra 12" f/5 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 39.5kg 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 10" f/5 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
StellaLyra · StellaLyra 12" f/5 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
At £619 versus £879, the StellaLyra 12" f/5 Dobsonian costs 42% more. It delivers 50mm more aperture — a real and visible advantage on faint targets.
If budget is a genuine constraint, the StellaLyra 10" f/5 Dobsonian will make you a happy observer. The StellaLyra 12" f/5 Dobsonian's optical advantage on faint targets is real and you are unlikely to regret it if you can stretch. If I had to choose without knowing your situation: start with the StellaLyra 10" f/5 Dobsonian, use it for a year, then upgrade knowing exactly what you want.
StellaLyra 10" f/5 Dobsonian
View StellaLyra 10" f/5 Dobsonian →StellaLyra 12" f/5 Dobsonian
View StellaLyra 12" f/5 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 10" f/5 Dobsonian | StellaLyra 12" f/5 Dobsonian |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 254mm | 304mm |
Focal Length Longer = more magnification potential | 1250mm | 1520mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/4.92 | f/5 |
Optical Design The type of optics — each design has different strengths | Dobsonian | Dobsonian |
How do you point it?
| Spec | StellaLyra 10" f/5 Dobsonian | StellaLyra 12" f/5 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 10" f/5 Dobsonian | StellaLyra 12" f/5 Dobsonian |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 2" | 2" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | 2" dual-speed Crayford (10:1) | 2" dual-speed Crayford (10:1) |
Size & weight
| Spec | StellaLyra 10" f/5 Dobsonian | StellaLyra 12" f/5 Dobsonian |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 15.5kg | 19.5kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 31.5kg | 39.5kg |
Tube Length | 1210mm | 1450mm |
What's in the box?
| Spec | StellaLyra 10" f/5 Dobsonian | StellaLyra 12" f/5 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 15mm 1.25" Super-Plössl, 30mm 2" Superview |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | 8x50 right-angled correct-image | 8x50 right-angled correct-image |
Blue highlight: StellaLyra 10" f/5 Dobsonian advantage · Amber highlight: StellaLyra 12" f/5 Dobsonian advantage · Greyed cells: equal or subjective.