Telescope Comparison
Bresser Messier 8" Dobsonian vs Sky-Watcher Quattro 200P
The Bresser Messier 8" Dobsonian is a complete setup. The Sky-Watcher Quattro 200P needs a mount before it's usable.
First light
Bresser · 203mm · £349
The maximum-aperture visual reflector
- 203mm 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
- 17.5kg total — designed for a fixed garden or regular dark-sky site, not casual transport
Sky-Watcher · 200mm · £599
The custom-rig optical tube
- 200mm newtonian reflector — optical tube only, no mount included
- 800mm focal length at f/4
- Requires a compatible mount before you can observe anything
- Best for: observers who already own a suitable mount or are building a specific imaging rig
- Not a complete purchase — budget at least £100–300 extra for a mount before observing
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Bresser Messier 8" Dobsonian gathers 1× 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
Bresser Messier 8" Dobsonian's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Sky-Watcher Quattro 200P's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Sky-Watcher Quattro 200P's faster f/4 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Bresser Messier 8" Dobsonian's f/5.91 provides more magnification per eyepiece — better for fine planetary detail.
Mount type
Sky-Watcher Quattro 200P has no mount — add a compatible mount before you can observe. Bresser Messier 8" Dobsonian is a complete ready-to-use system.
Weight (OTA)
Sky-Watcher Quattro 200P'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
Bresser Messier 8" Dobsonian is a DOBSONIAN; Sky-Watcher Quattro 200P is a Newtonian reflector (mirrors, needs occasional collimation). Different optical formulas produce different strengths — reflectors give more aperture per pound; refractors give sharper contrast and require no collimation.
At the eyepiece
| Target | Bresser Messier 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
| Planets | ||
| Moon | Excellent 203mm aperture resolves craters down to a few kilometres; the dual-speed focuser helps nail sharp focus at high power | Excellent 200mm resolves fine crater detail, rilles, and mountain shadows — though f/4 limits useful magnification compared to slower designs before image quality softens |
| Saturn | Excellent Cassini Division visible in steady seeing, cloud banding on the disc, and several moons including Titan easily spotted | Good 200mm shows rings, Cassini Division, and cloud banding, but the 800mm focal length requires heavy Barlowing for ideal planetary scale |
| Jupiter | Excellent Multiple cloud belts, Great Red Spot, and all four Galilean moons with shadow transits visible | Good Cloud belts, GRS, and Galilean moons visible, but the short focal length means you need a Barlow to reach useful magnification |
| Mars | Good Polar cap and dark surface features visible at opposition; the 1200mm focal length allows useful magnification with a short eyepiece | Good 200mm aperture resolves polar cap and major surface albedo features at opposition, though 800mm focal length keeps the disc small |
Deep sky | ||
| Orion Nebula (M42) | Excellent Bright layered nebulosity with Trapezium resolved; 1200mm focal length crops the widest extent but detail in the core is superb | Excellent 200mm at f/4 delivers bright, contrasty nebulosity with the Trapezium cleanly split; wide field captures the full extent including the Running Man |
| Andromeda Galaxy (M31) | Moderate 1200mm focal length shows the bright core and inner disc well, but the full 3° extent of the galaxy is cropped even with a wide-field 2" eyepiece | Excellent 800mm focal length frames the bright core and inner spiral arms well; 200mm aperture reveals dust lanes visually and captures the full halo in imaging |
| Open clusters | Moderate Compact clusters like the Double Cluster look fine, but large sprawling clusters like the Pleiades overfill the field at 1200mm | Excellent 800mm focal length and wide true field frame large clusters like the Double Cluster, Pleiades, and M35 beautifully |
| Globular clusters | Excellent 203mm resolves individual stars across the outer regions of M13 and M5; a defining strength of this aperture class | Good 200mm partially resolves outer stars in M13 and M22; core remains granular but not fully resolved |
| Faint galaxies | Good Galaxy groups like the Leo Triplet and Virgo Cluster members are within reach; spiral arm hints visible in M51 under dark skies | Good 200mm gathers enough light to detect galaxies in the Virgo Cluster and Leo Triplet; structure hints visible under dark skies |
| Milky Way / wide field | Not recommended 1200mm focal length is far too narrow for sweeping star fields — a wide-field refractor or binoculars serve this purpose better | Moderate 800mm is wider than most 8-inch Newtonians but still too narrow for sweeping Milky Way panoramas; f/4 speed helps with rich star fields |
Other | ||
| Double stars | Excellent 203mm aperture resolves doubles down to about 0.6 arcseconds; Dawes limit easily splits Albireo, the Double Double in Lyra, and many tighter pairs | Good 200mm resolves down to sub-arcsecond pairs, but f/4 makes tight doubles trickier — diffraction effects are more pronounced than in slower scopes |
| Astrophotography (deep sky) | Not recommended No tracking means exposures beyond a second or two trail; manual Dobsonian mount is unsuitable for deep-sky imaging | Not recommended No mount or tracking included — the OTA is excellent for deep-sky imaging but only once paired with a capable equatorial mount like the EQ6-R Pro |
| Astrophotography (planetary) | Moderate Planetary video capture with a high-speed camera is feasible — 203mm aperture and 1200mm focal length give a usable image scale, but manual tracking makes it fiddly | Moderate 200mm aperture is capable but 800mm focal length is short for planetary scale; needs a Barlow and a tracking mount not included |
| Emission nebulae (imaging) | Not applicable | Excellent The f/4 speed is ideal for narrowband imaging of large emission nebulae like the Veil, Rosette, and Heart — when mounted on an equatorial platform with guiding |
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
Bresser Messier 8" Dobsonian
- You'll unbox this, set the tube on the base, drop in an eyepiece, and be staring at the Orion Nebula inside fifteen minutes — no mount to assemble, no cables to run, no software to configure.
- Your typical session is a leisurely tour of the sky: you push the scope to M13, watch individual stars pop out of the cluster's edges at 150×, then nudge it every 30 seconds to keep the view centred — it's meditative until you're chasing a faint galaxy at 200× and the constant nudging becomes a chore.
- The dual-speed Crayford focuser pays off every time you push magnification on Saturn or Jupiter — you'll nail critical focus faster than friends using the single-speed racks on comparably priced Dobs, and that precision is the difference between seeing the Cassini Division and merely suspecting it's there.
Sky-Watcher Quattro 200P
- You won't observe anything the night this arrives — it's a tube with no mount, no eyepieces, and no finder, so your first weeks are spent assembling an imaging rig around it: equatorial mount, guide scope, guide camera, coma corrector, and getting backfocus spacing right to the millimetre.
- Once your rig is dialled in, you'll be stacking 60-second subs of the Rosette Nebula while your friend with an f/10 scope is still waiting for enough signal after four-minute exposures — the f/4 speed is genuinely transformative for deep-sky imaging sessions, especially on weeknights when you can't stay out until 3am.
- You'll spend more time at a laptop than at an eyepiece: your sessions revolve around plate-solving, guiding graphs, and checking collimation between targets, and the reward comes the next morning when you process the data and pull spiral arms out of a galaxy that looked like a grey smudge to your eye.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Bresser
Bresser Messier 8" Dobsonian
The Dobsonian base has no fine altitude control — when you swap to a heavier eyepiece or barlow, the tube can drop nose-down, and without a tension spring modification you'll be fighting balance all evening.
At f/5.9, coma stretches stars into little comets at the edge of wide-angle eyepieces — acceptable for casual sweeping but distracting if you've invested in a premium wide-field eyepiece, and a coma corrector adds roughly £100 to fix it.
The 1.2-metre tube and ~20kg assembled weight rule out balcony observing and make transport a two-trip affair — this is not a scope you grab for a quick 20-minute peek at the Moon.
Sky-Watcher
Sky-Watcher Quattro 200P
No mount is included, and the mounts capable of carrying and tracking this tube smoothly for imaging — like the EQ6-R Pro — start at around £1,200, pushing total rig cost well past £2,500 before you've bought a camera or guide setup.
Collimation at f/4 is unforgiving: a tiny shift after loading the scope onto the mount or transporting it to a dark site can ruin an entire night's data with elongated stars, and you'll need to check it at the start of every session.
The fast focal ratio makes the optical train sensitive to tilt, spacing errors, and focuser flex — if your coma corrector backfocus is off by even a couple of millimetres, you'll see asymmetric star shapes across the frame that no amount of post-processing can fix.
Which is right for you?
Two different buyers. Two different right answers.
The maximum-aperture visual reflector
Bresser · Bresser Messier 8" Dobsonian
You want to look through a telescope with your own eyes and see real detail — resolved stars in clusters, spiral arms in galaxies, the Cassini Division in Saturn's rings — without spending months learning astrophotography software or thousands on mount and camera gear. You're a beginner or a family who wants a scope that works the night it arrives, rewards curiosity with genuinely impressive views, and asks nothing more of you than a dark sky and the patience to nudge it by hand. If your budget is around £400 and you just want the most capability per pound for visual deep-sky observing, this is where you land.
The custom-rig optical tube
Sky-Watcher · Sky-Watcher Quattro 200P
You've already decided you want to photograph the sky, you understand what an equatorial mount does and why guiding matters, and you're ready to invest £2,500+ building a dedicated imaging rig around a proven optical tube. You're drawn to wide-field deep-sky targets — large nebulae, galaxy groups, emission regions — and you want the f/4 speed to keep your sub-exposures short and your total integration times manageable. If you don't already own a capable EQ mount and aren't prepared for the steep learning curve of collimation-critical fast optics, backfocus spacing, and image acquisition software, this scope will frustrate you before it rewards you.
Our verdict
This comparison has a catch: the Sky-Watcher Quattro 200P is a bare optical tube. You cannot use it without a separate mount — which adds meaningful cost and complexity. The Bresser Messier 8" Dobsonian is a complete, ready-to-observe package.
For most buyers, the Bresser Messier 8" Dobsonian is the right choice — you can observe the same night it arrives. The Sky-Watcher Quattro 200P makes sense if you already own a compatible mount, or are deliberately building a specific imaging setup piece by piece. If I had to choose for a first telescope: the Bresser Messier 8" Dobsonian, without hesitation.
Bresser Messier 8" Dobsonian
View Bresser Messier 8" Dobsonian →Sky-Watcher Quattro 200P
View Sky-Watcher Quattro 200P →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 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 203mm | 200mm |
Focal Length Longer = more magnification potential | 1200mm | 800mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/5.91 | f/4 |
Optical Design The type of optics — each design has different strengths | Dobsonian | Newtonian Reflector |
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 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Dobsonian | None (OTA only) |
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 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
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 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 11.5kg | 7.5kg |
Total Weight Full setup including mount — this is what you lug to the car | 17.5kg | — |
Tube Length | 1200mm | — |
Tube Material | Steel | Steel |
What's in the box?
| Spec | Bresser Messier 8" Dobsonian | Sky-Watcher Quattro 200P |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 25mm and 10mm eyepieces | — |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | 8x50 right-angle finder | — |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Bresser Messier 8" Dobsonian advantage · Amber highlight: Sky-Watcher Quattro 200P advantage · Greyed cells: equal or subjective.