Telescope Comparison
Omegon N 254/1250 Dobson vs StellaLyra 10" f/5 Dobsonian
The specs are close. The experience isn't.
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First light
Omegon · 254mm · £379
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
- 20kg total — designed for a fixed garden or regular dark-sky site, not casual transport
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
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)
Omegon N 254/1250 Dobson's optical tube is 2.0kg 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
Both scopes · same aperture
Both are 254mm 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.
The StellaLyra 10" f/5 Dobsonian costs 63% more. The premium buys a more capable mount and better build quality, not larger optics. For a first telescope, the Omegon N 254/1250 Dobson is the smarter entry point. Return to the StellaLyra 10" 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.
Omegon
Omegon N 254/1250 Dobson
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 20kg 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 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.
Which is right for you?
Two different buyers. Two different right answers.
The maximum-aperture visual reflector
Omegon · Omegon N 254/1250 Dobson
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 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
Our verdict
At £379 versus £619, the StellaLyra 10" f/5 Dobsonian costs 63% more. The extra money buys a more capable mount and better build quality, not larger optics.
For most buyers starting out, the Omegon N 254/1250 Dobson is the sensible choice — put the savings into a better eyepiece. The StellaLyra 10" f/5 Dobsonian makes sense once you know exactly why you need what it offers. If I had to choose: the Omegon N 254/1250 Dobson, and spend the difference on a quality eyepiece.
Omegon N 254/1250 Dobson
View Omegon N 254/1250 Dobson →StellaLyra 10" f/5 Dobsonian
View StellaLyra 10" 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 | Omegon N 254/1250 Dobson | StellaLyra 10" f/5 Dobsonian |
|---|---|---|
Aperture The most important spec — bigger = more light = better views | 254mm | 254mm |
Focal Length Longer = more magnification potential | 1250mm | 1250mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/4.9 | f/4.92 |
Optical Design The type of optics — each design has different strengths | Dobsonian | Dobsonian |
Coatings Better coatings = more light transmission through the optics | Parabolic primary mirror with aluminium coating and SiO2 overcoat | — |
How do you point it?
| Spec | Omegon N 254/1250 Dobson | StellaLyra 10" 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 | Omegon N 254/1250 Dobson | StellaLyra 10" 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 | Dual-speed Crayford | 2" dual-speed Crayford (10:1) |
Size & weight
| Spec | Omegon N 254/1250 Dobson | StellaLyra 10" f/5 Dobsonian |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 13.5kg | 15.5kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 20kg | 31.5kg |
Tube Length | 1230mm | 1210mm |
Tube Material | Aluminium | — |
What's in the box?
| Spec | Omegon N 254/1250 Dobson | StellaLyra 10" f/5 Dobsonian |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 10mm and 25mm eyepieces | 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-angle finder scope | 8x50 right-angled correct-image |
Diagonalⓘ Tilts the eyepiece 90° for comfortable viewing — useful on refractors | — |
Blue highlight: Omegon N 254/1250 Dobson advantage · Amber highlight: StellaLyra 10" f/5 Dobsonian advantage · Greyed cells: equal or subjective.