Telescope Comparison
Celestron NexStar 5SE vs Sky-Watcher SkyMax 150 Pro + HEQ5
The specs are close. The experience isn't.
First light
Celestron · 125mm · £799
The automated deep-sky platform
- 125mm schmidt-cassegrain on a computerised mount with motorised tracking
- Good for: Moon, planets, bright nebulae, star clusters, and deep-sky objects
- GoTo system finds any object in its database after initial star alignment — no star atlas needed
- Tracking motors keep objects centred as Earth rotates — useful above 100×, essential for photography
- 9.8kg total — requires a fixed garden spot or car transport
Sky-Watcher · 150mm · £999
The automated deep-sky platform
- 150mm maksutov-cassegrain on a computerised mount with motorised tracking
- Good for: Moon, planets, bright nebulae, star clusters, and deep-sky objects
- GoTo system finds any object in its database after initial star alignment — no star atlas needed
- Tracking motors keep objects centred as Earth rotates — useful above 100×, essential for photography
- 24kg total — requires a fixed garden spot or car transport
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Sky-Watcher SkyMax 150 Pro + HEQ5 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 SkyMax 150 Pro + HEQ5's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Celestron NexStar 5SE's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Celestron NexStar 5SE's faster f/10 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Sky-Watcher SkyMax 150 Pro + HEQ5's f/12 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)
Celestron NexStar 5SE's optical tube is 1.5kg lighter. Relevant if you plan to use it on multiple mounts or carry the tube to dark-sky sites separately.
Optical design
Celestron NexStar 5SE is a Schmidt-Cassegrain (mirror and corrector, versatile focal lengths); Sky-Watcher SkyMax 150 Pro + HEQ5 is a Maksutov-Cassegrain (mirror and lens corrector, compact tube). Different optical formulas produce different strengths — reflectors give more aperture per pound; refractors give sharper contrast and require no collimation.
At the eyepiece
| Target | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
| Planets | ||
| Moon | Excellent 125mm aperture and f/10 focal ratio reward high-magnification lunar detail — craters, rilles, and shadow features are crisp and well-defined | Excellent 150mm aperture and f/12 focal ratio deliver exceptional lunar detail — rilles, crater terraces, and shadow play at high magnification |
| Saturn | Good Rings clearly defined, Cassini Division visible in good seeing; 125mm aperture just misses the top tier but 1250mm focal length suits planetary scale | Excellent 150mm aperture and 1800mm focal length clearly show the Cassini Division, disc banding, and shadow of the rings on the globe |
| Jupiter | Good Two or more cloud belts, Great Red Spot, and Galilean moon shadows visible; focal length supports 200×+ comfortably | Excellent Multiple cloud belts, the Great Red Spot, and moon shadow transits are visible; 1800mm focal length gives large image scale |
| Mars | Moderate Polar cap and major albedo features visible at opposition; 125mm aperture limits fine surface detail | Good 150mm aperture shows polar cap and major dark surface features at opposition; falls short of the 200mm+ needed for Excellent |
Deep sky | ||
| Orion Nebula (M42) | Good Bright core and Trapezium well resolved, but 1250mm focal length and f/10 ratio crop the full extent of the nebulosity | Good Bright core, trapezium stars, and inner nebulosity are well-resolved, but 1800mm focal length frames only the central region |
| Andromeda Galaxy (M31) | Moderate 1250mm focal length shows only the bright core; the galaxy's full 3° extent is far wider than the eyepiece field | Moderate 1800mm focal length crops heavily — only the bright nucleus and inner core are visible; outer spiral arms are entirely out of field |
| Open clusters | Moderate Many open clusters overfill the narrow field of view; best suited to compact clusters like M37 or M11 | Moderate Narrow field restricts most large open clusters; compact clusters like M11 are rewarding but Pleiades or Double Cluster overflow the field |
| Globular clusters | Moderate Granular texture visible in M13 and M3 at high power, but 125mm aperture cannot fully resolve individual stars across the core | Good 150mm resolves stars at the edges of M13 and M92; the long focal length helps by providing high magnification natively |
| Faint galaxies | Moderate 125mm gathers enough light for dozens of Messier and brighter NGC galaxies as small fuzzy patches; limited detail | Good 150mm gathers enough light for brighter Messier and some NGC galaxies, though the narrow field makes finding them harder |
| Milky Way / wide field | Not recommended 1250mm focal length gives far too narrow a field for sweeping star fields or Milky Way context | Not recommended 1800mm focal length produces far too narrow a field for star-field sweeping — less than 1° even with the longest eyepieces |
Other | ||
| Double stars | Excellent 125mm aperture and f/10 focal ratio produce clean, tight Airy discs — resolves pairs down to about 1 arcsecond | Excellent 150mm aperture with f/12 unobstructed optics produces clean, high-contrast Airy discs ideal for splitting tight pairs down to ~0.8 arcseconds |
| Astrophotography (deep sky) | Moderate Alt-az GoTo mount tracks but introduces field rotation, limiting useful exposures to a few seconds; suited to EAA or lucky imaging, not long-exposure work | Moderate HEQ5 provides equatorial tracking but f/12 demands impractically long exposures for faint targets; narrow field limits suitable subjects |
| Astrophotography (planetary) | Moderate 1250mm focal length and tracking mount suit webcam/planetary camera stacking; 125mm aperture is the limiting factor for fine detail | Good 150mm aperture and 1800mm native focal length give large image scale for lucky imaging; HEQ5 tracking keeps targets centred |
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
Celestron NexStar 5SE
- You'll walk outside, set the scope on the patio, run SkyAlign in under five minutes, and be looking at Saturn's rings before your coffee goes cold — no polar alignment, no counterweights, no fuss.
- You'll carry the entire rig in one trip and set up on a balcony, a campsite, or a friend's garden without thinking twice about weight — and that portability is the reason you'll actually use it on a weeknight.
- You'll get sharp planetary views that punch above their weight for 125mm, but when you try to frame the Pleiades or the full sweep of M31, you'll feel the f/10 focal length boxing you in — this scope rewards you for chasing compact, bright targets and penalises wandering.
Sky-Watcher SkyMax 150 Pro + HEQ5
- You'll spend the first ten minutes polar-aligning the HEQ5, then another thirty to sixty minutes waiting for the sealed Mak tube to cool down — your observing sessions start slow, but once the optics settle, the planetary detail at 150mm and f/12 is a genuine step up from smaller apertures.
- You'll see festoons on Jupiter and limb detail on Mars that the 5SE simply can't resolve, and when you bolt on a planetary camera, the HEQ5's equatorial tracking gives you clean lucky-imaging stacks without field rotation — this is a scope with a real imaging pathway for planets and the Moon.
- You'll commit to a fixed observing spot because the 24kg combined weight isn't something you casually throw in the car — but that commitment buys you a mount that can guide accurately and a tube that holds collimation season after season with zero maintenance.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Celestron
Celestron NexStar 5SE
The single-arm fork and plastic tripod legs create a vibration problem you'll feel every time you refocus or a breeze picks up — at 200× on Jupiter, expect several seconds of wobble before the image settles.
Eight AA batteries drain fast in cold weather, and you'll learn the hard way that an external power tank isn't optional — it's a running cost baked into ownership.
The alt-az GoTo mount introduces field rotation during longer exposures, so if you're hoping to grow into deep-sky astrophotography, this mount draws a hard line at short-exposure planetary or EAA work.
Sky-Watcher
Sky-Watcher SkyMax 150 Pro + HEQ5
The sealed Maksutov tube needs 30–60 minutes of cool-down before it delivers sharp high-magnification views — skip this step and you'll see bloated, mushy star images that waste the aperture advantage.
The corrector plate dews over readily in humid conditions, so a dew heater is effectively a mandatory accessory on top of the purchase price.
At roughly 24kg fully assembled, the HEQ5 is near its practical payload limit with this OTA plus accessories — adding a heavy camera, guidescope, or dew heater pushes the mount into territory where tracking accuracy suffers.
Which is right for you?
Two different buyers. Two different right answers.
The automated deep-sky platform
Celestron · Celestron NexStar 5SE
You want a telescope you'll actually use on a Tuesday night. You live in a flat or a house with a small garden, you want to see Saturn's rings and cruise through a few dozen deep-sky targets without learning star-hopping, and you need to be set up in five minutes and packed away in three. You're not chasing the faintest galaxies or planning to image — you just want sharp planets, easy GoTo, and a scope light enough to carry in one hand. The NexStar 5SE is built for exactly that life.
The automated deep-sky platform
Sky-Watcher · Sky-Watcher SkyMax 150 Pro + HEQ5
You've already decided that planets, the Moon, and double stars are what excite you most, and you want the sharpest possible views in that domain without spending thousands. You're willing to polar-align, wait for cool-down, and dedicate a corner of the garden or a permanent pier to a heavier setup because you know the reward is noticeably finer detail than a smaller aperture can deliver. If you're also planning to attach a planetary camera and start lucky-imaging Jupiter and Saturn, the HEQ5's equatorial tracking gives you a genuine upgrade path that the 5SE's alt-az fork simply cannot offer.
Our verdict
These two are closer than most comparisons on this site. The spec differences are genuine — mount type, focal ratio — but neither is the wrong answer for a typical observer starting out.
If I had to choose between them: the Celestron NexStar 5SE is the scope most people will be using regularly six months from now. The Sky-Watcher SkyMax 150 Pro + HEQ5 rewards you more once you know what you're doing — it's worth revisiting after your first year.
Celestron NexStar 5SE
View Celestron NexStar 5SE →Sky-Watcher SkyMax 150 Pro + HEQ5
View Sky-Watcher SkyMax 150 Pro + HEQ5 →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 | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 125mm | 150mm |
Focal Length Longer = more magnification potential | 1250mm | 1800mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/10 | f/12 |
Optical Design The type of optics — each design has different strengths | Schmidt-Cassegrain | Maksutov-Cassegrain |
Coatings Better coatings = more light transmission through the optics | StarBright XLT fully multi-coated on all optical surfaces | Fully multi-coated Maksutov-Cassegrain optics |
How do you point it?
| Spec | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | GoTo (Computerised) | GoTo (Computerised) |
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 | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Focuser Size 2" accepts wider eyepieces and gives better low-power views | 1.25" | 1.25" |
Focuser Type Rack-and-pinion is standard; Crayford and dual-speed are smoother | SCT rear-cell focuser | Rear-cell focuser |
Size & weight
| Spec | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 2.7kg | 4.2kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 9.8kg | 24kg |
Tube Length | 330mm | 480mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Celestron NexStar 5SE | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 25mm Plössl | 25mm Super eyepiece |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | StarPointer red dot finder | 8x50 right-angle finder with illuminated reticle |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Celestron NexStar 5SE advantage · Amber highlight: Sky-Watcher SkyMax 150 Pro + HEQ5 advantage · Greyed cells: equal or subjective.