Telescope Comparison
Bresser Messier 12" Dobsonian vs Sky-Watcher Skyliner 350P
The price gap is real. The question is whether the extra capability is worth it at your stage.
First light
Bresser · 305mm · £699
The maximum-aperture visual reflector
- 305mm 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
- 42kg total — designed for a fixed garden or regular dark-sky site, not casual transport
Sky-Watcher · 355mm · £1,099
The maximum-aperture visual reflector
- 355mm 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
- 58kg 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
Sky-Watcher Skyliner 350P 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
Sky-Watcher Skyliner 350P's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Bresser Messier 12" Dobsonian's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Sky-Watcher Skyliner 350P's faster f/4.51 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Bresser Messier 12" Dobsonian's f/5 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)
Bresser Messier 12" Dobsonian's optical tube is 9.0kg 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
| Target | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
| Planets | ||
| Moon | Excellent 305mm aperture delivers overwhelming detail — craterlets, rilles, and shadow play at 200–300×; a neutral density filter helps manage brightness | Excellent 355mm aperture delivers overwhelming lunar detail — rilles, dome fields, and tiny craterlets visible at high magnification in steady seeing |
| Saturn | Excellent Cassini Division easily visible, Crepe Ring and cloud banding on the disc accessible in steady seeing at 250×+ | Excellent Cassini Division, ring structure, and subtle cloud banding on the disc; 1600mm focal length supports high magnification |
| Jupiter | Excellent Multiple cloud belts, festoons, the Great Red Spot, and moon shadow transits visible; 1525mm focal length supports high magnification well | Excellent Festoons, barges, and fine belt structure visible; GRS detail and moon shadow transits are striking at 200x+ |
| Mars | Excellent At 305mm and 1525mm focal length, dark albedo features, polar caps, and occasional dust storm effects visible near opposition | Excellent 355mm aperture and 1600mm focal length exceed the rubric thresholds — surface albedo features, polar caps, and limb phenomena at opposition |
Deep sky | ||
| Orion Nebula (M42) | Excellent Trapezium cleanly split, extensive nebulosity with hints of colour; 1525mm focal length crops the widest extent but detail is superb | Excellent Massive aperture reveals layered nebulosity and faint outer wings; Trapezium E and F stars resolved — though the 1600mm focal length shows the core region more than the full extent |
| Andromeda Galaxy (M31) | Moderate 1525mm focal length shows only the bright core and inner disc — too narrow to frame the full 3° extent; dust lanes visible but outer halo is cropped | Moderate 1600mm focal length crops the outer halo heavily — you see the bright core and inner dust lanes but not the full 3° extent |
| Open clusters | Moderate 1525mm focal length means larger clusters like the Double Cluster overfill the field; compact clusters like M37 are well-served | Moderate 1600mm focal length means large clusters like the Double Cluster or Pleiades overfill the field; compact clusters like M11 and M37 fare better |
| Globular clusters | Excellent 305mm resolves individual stars across the core of M13, M3, and M5 — one of this scope's signature strengths | Excellent 355mm resolves individual stars well into the core of M13, M5, and M22 — even dimmer globulars like M56 show granularity |
| Faint galaxies | Excellent 305mm pulls in galaxies to mag 14+; spiral arm structure visible in M51, NGC 891's dust lane detectable from dark sites | Excellent The scope's strongest suit — 355mm pulls spiral arm hints from M51, reveals the dust lane in NGC 891, and makes Virgo Cluster galaxies accessible by the dozen |
| Milky Way / wide field | Not recommended 1525mm focal length gives far too narrow a field for sweeping star fields — a separate wide-field instrument is needed | Not recommended 1600mm focal length and minimum magnification ~50x make sweeping star fields impractical — use binoculars instead |
Other | ||
| Double stars | Excellent 305mm resolves pairs under 0.5 arcsecond; f/5 is faster than ideal for tight doubles but a Barlow sharpens the Airy disc at high power | Excellent 355mm gives a Dawes limit around 0.33 arcsec; tight doubles like Porrima and Epsilon Boötis split cleanly when collimation and seeing cooperate |
| Astrophotography (deep sky) | Not recommended Manual Dobsonian mount has no tracking — long exposures are not possible | Not applicable |
| Astrophotography (planetary) | Moderate Lucky imaging with a high-speed camera is technically possible at 305mm, but manual tracking makes it difficult to keep targets centred; results are inconsistent | Good 355mm aperture and 1600mm focal length suit high-resolution planetary imaging with a high-speed camera, but manual alt-az tracking limits capture run length |
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
Bresser Messier 12" Dobsonian
- You can still wrestle this scope into a large car boot on your own — at 42kg it's a one-person job if you're reasonably fit, whereas the Skyliner 350P essentially demands a second pair of hands or a trolley and a van.
- You'll resolve globular clusters to the core and pull real structure from galaxies, but you'll occasionally look at a faint interacting pair like the Antennae and wish you had those extra 50mm of aperture — the 12-inch is genuinely excellent on deep sky, but the 14-inch crosses another threshold on the faintest targets.
- At f/5, coma is noticeable but manageable — you'll want a coma corrector for your wide-angle eyepieces, but you won't feel the optics are punishing you the way the Skyliner's f/4.5 cone does if collimation drifts even slightly.
Sky-Watcher Skyliner 350P
- You're committing to a logistics operation every time you observe — at 58kg with a truss tube that needs assembly and a light shroud, your session starts with 15–20 minutes of setup before you even think about collimation and cooldown.
- You'll see things that the 12-inch simply can't deliver: faint galaxy group members jump from 'maybe averted vision' to 'definitely there,' Palomar-class globulars become real targets, and the extra aperture pulls genuine structure from dim planetary nebulae like NGC 2392.
- You'll spend more money to use this scope properly — a Paracorr-style coma corrector is effectively mandatory at f/4.5, and the included eyepieces won't come close to exploiting 355mm of aperture, so budget another £200–£400 on top of the higher purchase price.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Bresser
Bresser Messier 12" Dobsonian
At 42kg total, solo transport is physically demanding — you need a car with a large boot or folded rear seats, and you'll feel it in your back after a few trips across a dark-site car park.
The f/5 focal ratio produces noticeable coma in the outer 30% of the field with wide-angle eyepieces, so a coma corrector is a near-essential accessory that adds to the real cost of ownership.
Cool-down time runs 30–60 minutes for the 305mm primary — you'll lose the first part of your session to thermal equilibrium, especially in winter when the temperature differential between your garage and the field is large.
Sky-Watcher
Sky-Watcher Skyliner 350P
The 58kg total weight and truss-tube design mean you realistically need a van or large estate car, ground-floor storage, and ideally a helper — this scope is not portable in any normal sense of the word.
Collimation at f/4.5 is critical and unforgiving: even a small misalignment visibly degrades planetary and high-power performance, so you'll be checking and adjusting every single session, especially after transport.
The open truss tube requires a light shroud to maintain contrast at anything other than a pristine dark site — without one, stray light washes out the faint targets that justify owning a 14-inch in the first place.
Which is right for you?
Two different buyers. Two different right answers.
The maximum-aperture visual reflector
Bresser · Bresser Messier 12" Dobsonian
You'll love the Bresser 12" if you're an intermediate observer who wants serious deep-sky aperture without completely surrendering your ability to observe solo. You can fit this in a car, set it up alone, and still resolve globular cluster cores and pull structure from galaxy groups that an 8-inch only hints at. If you're ready to invest in a coma corrector and better eyepieces, this scope will reward you for years at dark sites — and at £699, it offers extraordinary aperture per pound. This isn't for you if you want grab-and-go convenience, astrophotography capability, or anything that tracks objects for you.
The maximum-aperture visual reflector
Sky-Watcher · Sky-Watcher Skyliner 350P
You'll love the Skyliner 350P if you're an experienced visual observer who has already owned a smaller Dobsonian and knows exactly what more aperture will give you — and you're willing to pay for it in weight, setup time, and accessory costs. You'll hunt faint interacting galaxies, dim Palomar globulars, and planetary nebulae detail that the 12-inch can't quite reach, and every session will justify the effort. This isn't for you if you don't have van-level transport and ground-floor storage, if you're still learning collimation, or if the idea of a 58kg scope that demands a light shroud, a Paracorr, and 45–60 minutes of cooldown sounds like work rather than ritual.
Our verdict
At £699 versus £1,099, the Sky-Watcher Skyliner 350P costs 57% more. It delivers 50mm more aperture — a real and visible advantage on faint targets.
If budget is a genuine constraint, the Bresser Messier 12" Dobsonian will make you a happy observer. The Sky-Watcher Skyliner 350P'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 Bresser Messier 12" Dobsonian, use it for a year, then upgrade knowing exactly what you want.
Bresser Messier 12" Dobsonian
View Bresser Messier 12" Dobsonian →Sky-Watcher Skyliner 350P
View Sky-Watcher Skyliner 350P →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 | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 305mm | 355mm |
Focal Length Longer = more magnification potential | 1525mm | 1600mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/5 | f/4.51 |
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, fully coated | Parabolic primary mirror, fully multi-coated |
How do you point it?
| Spec | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
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 | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
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" with 1.25" adapter) | Dual-speed Crayford (10:1 reduction) |
Size & weight
| Spec | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 27kg | 36kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 42kg | 58kg |
Tube Length | 1525mm | 1600mm |
Tube Material | Steel | Steel |
What's in the box?
| Spec | Bresser Messier 12" Dobsonian | Sky-Watcher Skyliner 350P |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 25mm and 10mm eyepieces | 25mm and 10mm Super eyepieces |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | 8x50 right-angle finder | 8x50 right-angle correct-image finder |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Bresser Messier 12" Dobsonian advantage · Amber highlight: Sky-Watcher Skyliner 350P advantage · Greyed cells: equal or subjective.