Telescope Comparison
Celestron NexStar Evolution 6 vs Sky-Watcher SkyMax 150 Pro + HEQ5
The specs are close. The experience isn't.
First light
Celestron · 150mm · £1,299
The automated deep-sky platform
- 150mm 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
- 12.5kg 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
Equal light-gathering. Aperture won't settle this comparison — the mount, focal ratio, and observing experience are what differ.
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 Evolution 6's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Celestron NexStar Evolution 6'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)
Similar optical tube weight. Any portability difference between these setups comes from the mount, not the tube itself.
Optical design
Celestron NexStar Evolution 6 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 Evolution 6 | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
| Planets | ||
| Moon | Excellent 150mm aperture at f/10 delivers superb high-magnification lunar detail — rilles, crater chains, and mountain shadows are crisp | Excellent 150mm aperture and f/12 focal ratio deliver exceptional lunar detail — rilles, crater terraces, and shadow play at high magnification |
| Saturn | Excellent 150mm aperture and 1500mm focal length resolve the Cassini Division and subtle cloud banding in good seeing | Excellent 150mm aperture and 1800mm focal length clearly show the Cassini Division, disc banding, and shadow of the rings on the globe |
| Jupiter | Excellent Multiple cloud belts, GRS, and moon shadow transits visible at 150–250x | Excellent Multiple cloud belts, the Great Red Spot, and moon shadow transits are visible; 1800mm focal length gives large image scale |
| Mars | Good 150mm aperture shows dark albedo features and polar cap at opposition; surface detail improves with a red filter | 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 Core and trapezium resolved well, but 1500mm focal length crops the full nebula extent | Good Bright core, trapezium stars, and inner nebulosity are well-resolved, but 1800mm focal length frames only the central region |
| Andromeda Galaxy (M31) | Moderate 1500mm focal length shows only the bright core — the outer halo and companion galaxies overfill the 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 Narrow field crops large clusters like the Pleiades; compact clusters like M11 fare better | Moderate Narrow field restricts most large open clusters; compact clusters like M11 are rewarding but Pleiades or Double Cluster overflow the field |
| Globular clusters | Good 150mm resolves outer stars in M13 and M92; cores remain granular but impressive | Good 150mm resolves stars at the edges of M13 and M92; the long focal length helps by providing high magnification natively |
| Faint galaxies | Good 150mm gathers enough light for M51, M81/M82, and other Messier galaxies as soft glows with some structure hints | 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 1500mm focal length is far too narrow for sweeping star fields — field of view under 1° | 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 150mm aperture at f/10 cleanly splits sub-arcsecond pairs; diffraction-limited performance rewards tight doubles | 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 (planetary) | Good 150mm at 1500mm focal length with GoTo tracking is well suited to lucky imaging with a planetary camera | Good 150mm aperture and 1800mm native focal length give large image scale for lucky imaging; HEQ5 tracking keeps targets centred |
| Astrophotography (deep sky) | Moderate Alt-az GoTo mount limits exposures to ~15–30 seconds before field rotation becomes apparent; bright targets only | Moderate HEQ5 provides equatorial tracking but f/12 demands impractically long exposures for faint targets; narrow field limits suitable subjects |
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
Celestron NexStar Evolution 6
- You'll unbox it, charge it, connect your phone, and be observing in under ten minutes — no power cables, no hand controller, no polar alignment; the WiFi app alignment and built-in battery make setup feel modern and frictionless.
- You'll get satisfying views of Saturn's rings, Jupiter's belts, and a solid range of deep-sky targets like M13 and the Orion Nebula, and at f/10 the slightly wider field of view compared to the SkyMax means you can frame a bit more of extended objects before they overfill the eyepiece.
- You'll carry roughly 13kg to your observing spot instead of 24kg, which means you'll actually bring this scope out on weeknights — but you'll also know that the alt-az mount is a dead end for anything beyond short-exposure planetary snapshots.
Sky-Watcher SkyMax 150 Pro + HEQ5
- You'll spend your first ten minutes on polar alignment and balancing the mount, and you'll need a power source and cables — but once you're tracking, you'll notice the equatorial drive holds planets rock-steady at 300x in a way the Evolution's alt-az mount simply can't match.
- You'll see finer planetary detail at f/12 and 1800mm than the Evolution's f/10 delivers — festoons on Jupiter, limb brightening on Mars — and when you plug in a high-speed planetary camera, the HEQ5's equatorial tracking means you're doing real lucky-imaging without fighting field rotation.
- You'll be hauling nearly 24kg of gear and setting up a dew heater before every session, so this becomes a scope you use deliberately on clear, settled nights rather than something you grab on a whim.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Celestron
Celestron NexStar Evolution 6
The alt-az GoTo mount introduces field rotation on exposures longer than roughly 15–30 seconds, making deep-sky astrophotography a non-starter without a wedge — if planetary imaging is your goal, you'll hit this ceiling quickly.
The sealed SCT tube needs 30–45 minutes of cooldown before high-magnification views stabilise; until then, Jupiter and Saturn shimmer with thermal currents you can't shortcut past.
With a true field of view around 0.8° using the supplied 25mm eyepiece, you're entirely dependent on the GoTo system to find targets — if the WiFi alignment goes wrong or the battery dies mid-session, you have no practical fallback.
Sky-Watcher
Sky-Watcher SkyMax 150 Pro + HEQ5
The Maksutov's sealed design takes 30–60 minutes to reach thermal equilibrium — noticeably longer than the Evolution — and you'll learn to start cooldown before you even begin polar alignment.
The HEQ5 is near its practical payload limit with this OTA plus accessories; add a camera, dew heater, and guide scope and you risk compromising tracking accuracy from the overloaded mount.
The exposed corrector plate dews up readily in humid conditions, and without a dew heater band you'll lose the view mid-session — this is effectively a mandatory additional purchase, not an optional accessory.
Which is right for you?
Two different buyers. Two different right answers.
The automated deep-sky platform
Celestron · Celestron NexStar Evolution 6
You want a capable all-rounder that you'll actually use on a work night. You observe from a suburban garden or balcony, you like controlling your scope from your phone, and you want decent planetary views plus access to the brighter deep-sky catalogue without wrestling cables or polar alignment. You're not planning serious astrophotography — you just want to look at things, and you want the setup process to disappear. The extra £300 over the SkyMax buys you convenience and portability, not optical superiority.
The automated deep-sky platform
Sky-Watcher · Sky-Watcher SkyMax 150 Pro + HEQ5
You're specifically chasing the sharpest possible planetary and lunar detail at the eyepiece, and you want a real pathway into planetary imaging with a high-speed camera. You don't mind a 10-minute setup ritual involving polar alignment, counterweights, and a dew heater — you see that as the price of equatorial tracking that actually holds a target steady at 300x. You have a fixed spot to observe from, because you're not casually carrying 24kg into a dark field, and you accept that deep-sky work is a sideshow with this scope. The £999 price makes this the better value if planetary performance is your priority.
Our verdict
Same aperture, same light-gathering, £300 price difference. The extra cost of the Celestron NexStar Evolution 6 buys a different mount — not better optics.
For most beginners, the Sky-Watcher SkyMax 150 Pro + HEQ5 is the right starting point — the optics are identical and the savings are better spent on a quality eyepiece or a dark-sky trip. The Celestron NexStar Evolution 6 makes sense if the mount it comes with is specifically what you want to learn. If I had to choose: the Sky-Watcher SkyMax 150 Pro + HEQ5 — same sky, less money.
Celestron NexStar Evolution 6
View Celestron NexStar Evolution 6 →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 Evolution 6 | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Aperture The most important spec — bigger = more light = better views | 150mm | 150mm |
Focal Length Longer = more magnification potential | 1500mm | 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 Evolution 6 | 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 Evolution 6 | 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 Evolution 6 | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 3.5kg | 4.2kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 12.5kg | 24kg |
Tube Length | 394mm | 480mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Celestron NexStar Evolution 6 | 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 |
Smart features
| Spec | Celestron NexStar Evolution 6 | Sky-Watcher SkyMax 150 Pro + HEQ5 |
|---|---|---|
Built-in Camera Records and stacks images automatically — no separate camera needed | ||
App Controlled | ||
WiFi | ||
Battery Included |
Blue highlight: Celestron NexStar Evolution 6 advantage · Amber highlight: Sky-Watcher SkyMax 150 Pro + HEQ5 advantage · Greyed cells: equal or subjective.