Telescope Comparison
Sky-Watcher Explorer 150PDS OTA vs Vixen R130Sf
The specs are close. The experience isn't.
First light
Sky-Watcher · 150mm · £229
The custom-rig optical tube
- 150mm newtonian reflector — optical tube only, no mount included
- 750mm focal length at f/5
- 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
Vixen · 130mm · £349
The custom-rig optical tube
- 130mm newtonian reflector — optical tube only, no mount included
- 650mm focal length at f/5
- 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
Sky-Watcher Explorer 150PDS OTA gathers 1.3× 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 Explorer 150PDS OTA's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Vixen R130Sf'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
Neither scope includes a mount — both require a separate purchase before you can observe.
Weight (OTA)
Vixen R130Sf's optical tube is 2.4kg lighter. Relevant if you plan to use it on multiple mounts or carry the tube to dark-sky sites separately.
Optical design
Both are Newtonian reflectors — the same optical formula. Any performance difference comes from collimation quality, focal ratio, and eyepiece choice, not the design itself.
At the eyepiece
Sky-Watcher
Sky-Watcher Explorer 150PDS OTA
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 clear structure — nebulosity spreading around the Trapezium, which splits at moderate power. The Andromeda Galaxy (M31) shows a concentrated core clearly. The Hercules Cluster (M13) shows some resolution at the edges at higher magnification.
Vixen
Vixen R130Sf
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 clear structure — nebulosity spreading around the Trapezium, which splits at moderate power. The Andromeda Galaxy (M31) shows a concentrated core clearly. The Hercules Cluster (M13) shows some resolution at the edges at higher magnification.
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
The Vixen R130Sf costs 52% more. The premium buys a more capable mount and better build quality, not larger optics. For a first telescope, the Sky-Watcher Explorer 150PDS OTA is the smarter entry point. Return to the Vixen R130Sf when you know from experience what you actually need.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Sky-Watcher
Sky-Watcher Explorer 150PDS OTA
No mount included
You cannot observe until you buy a separate compatible mount — add at least £100–300 before you have a working telescope.
Nothing to look through on day one
Until a mount arrives, the optical tube is a piece of glass you cannot point at the sky.
Vixen
Vixen R130Sf
No mount included
You cannot observe until you buy a separate compatible mount — add at least £100–300 before you have a working telescope.
Nothing to look through on day one
Until a mount arrives, the optical tube is a piece of glass you cannot point at the sky.
Which is right for you?
Two different buyers. Two different right answers.
The custom-rig optical tube
Sky-Watcher · Sky-Watcher Explorer 150PDS OTA
You’ll love this if…
- You already own a compatible equatorial or alt-az mount — this is the optical tube you've specifically chosen to put on it
- You're building an imaging rig piece by piece and know exactly what you need at the end of a focuser
- Choosing an optical tube independently of the mount gives you more flexibility over your overall system
This will frustrate you if…
- You buy it without fully accounting for the mount — add at least £100–300 to the purchase price before you have a working telescope
- You expected a complete package and didn't realise this is a bare optical tube that cannot be used without a separate mount
The custom-rig optical tube
Vixen · Vixen R130Sf
You’ll love this if…
- You already own a compatible equatorial or alt-az mount — this is the optical tube you've specifically chosen to put on it
- You're building an imaging rig piece by piece and know exactly what you need at the end of a focuser
- Choosing an optical tube independently of the mount gives you more flexibility over your overall system
This will frustrate you if…
- You buy it without fully accounting for the mount — add at least £100–300 to the purchase price before you have a working telescope
- You expected a complete package and didn't realise this is a bare optical tube that cannot be used without a separate mount
Our verdict
At £229 versus £349, the Vixen R130Sf costs 52% more. The extra money buys a more capable mount and better build quality, not larger optics.
For most buyers starting out, the Sky-Watcher Explorer 150PDS OTA is the sensible choice — put the savings into a better eyepiece. The Vixen R130Sf makes sense once you know exactly why you need what it offers. If I had to choose: the Sky-Watcher Explorer 150PDS OTA, and spend the difference on a quality eyepiece.
Sky-Watcher Explorer 150PDS OTA
View Sky-Watcher Explorer 150PDS OTA →Vixen R130Sf
View Vixen R130Sf →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 | Sky-Watcher Explorer 150PDS OTA | Vixen R130Sf |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 150mm | 130mm |
Focal Length Longer = more magnification potential | 750mm | 650mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/5 | f/5 |
Optical Design The type of optics — each design has different strengths | Newtonian Reflector | Newtonian Reflector |
Coatings Better coatings = more light transmission through the optics | Parabolic primary mirror with aluminium coating and SiO2 overcoat | Parabolic primary mirror with aluminium coating |
How do you point it?
| Spec | Sky-Watcher Explorer 150PDS OTA | Vixen R130Sf |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | None (OTA only) | 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 | Sky-Watcher Explorer 150PDS OTA | Vixen R130Sf |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 2" / 1.25" | 2" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | Dual-speed Crayford (10:1) | Dual-speed Crayford |
Size & weight
| Spec | Sky-Watcher Explorer 150PDS OTA | Vixen R130Sf |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 5.2kg | 2.8kg |
Tube Length | 710mm | 620mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Sky-Watcher Explorer 150PDS OTA | Vixen R130Sf |
|---|---|---|
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Sky-Watcher Explorer 150PDS OTA advantage · Amber highlight: Vixen R130Sf advantage · Greyed cells: equal or subjective.