Telescope Comparison
Omegon Advanced 150/750 EQ3 vs Omegon Advanced 203/1000 EQ4
203mm versus 150mm — the aperture difference is the comparison.
First light
Omegon · 150mm · £279
The sky-learner's equatorial scope
- 150mm newtonian reflector on a manual equatorial mount
- Good for: Moon, planets, bright star clusters and nebulae
- Setup includes rough polar alignment before observing — more steps than a simple alt-az
- Mount axes feel counterintuitive at first; users find they become natural after several sessions
- Keeps the door open for adding tracking motors and moving into astrophotography later
Omegon · 203mm · £449
The sky-learner's equatorial scope
- 203mm newtonian reflector on a manual equatorial mount
- Good for: Moon, planets, bright star clusters and nebulae
- Setup includes rough polar alignment before observing — more steps than a simple alt-az
- Mount axes feel counterintuitive at first; users find they become natural after several sessions
- Keeps the door open for adding tracking motors and moving into astrophotography later
The full picture
The numbers that separate these two scopes — and what they mean at the eyepiece.
Aperture
Omegon Advanced 203/1000 EQ4 gathers 1.8× 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
Omegon Advanced 203/1000 EQ4's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Omegon Advanced 150/750 EQ3'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
Same mount type — setup experience and ergonomics will be similar. Differences lie in build quality and included accessories.
Weight (OTA)
Omegon Advanced 150/750 EQ3's optical tube is 3.4kg 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
Omegon
Omegon Advanced 150/750 EQ3
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.
Omegon
Omegon Advanced 203/1000 EQ4
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 wide nebulosity with the Trapezium splitting cleanly into four points at 80×. The Hercules Cluster (M13) begins to resolve into individual stars at the outer edges at higher magnification. The Andromeda Galaxy (M31) fills a wide-field eyepiece; the bright core and inner disc are obvious, and on a dark night the dust lane becomes visible with careful looking. The Omegon Advanced 203/1000 EQ4 gathers 1.8× more light than the Omegon Advanced 150/750 EQ3 — a difference that's marginal on bright targets but visible on fainter ones: dimmer galaxies, faint globular clusters, and extended nebulosity that sits below the threshold of the smaller aperture.
The real tradeoff
Both scopes are capable. The question is which one fits the way you actually observe.
The Omegon Advanced 203/1000 EQ4 costs 61% more. It delivers 53mm more aperture — a real and visible advantage on faint targets. For a first telescope, the Omegon Advanced 150/750 EQ3 is the smarter entry point. Return to the Omegon Advanced 203/1000 EQ4 when you know from experience what you actually need.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Omegon
Omegon Advanced 150/750 EQ3
Mount axes feel counterintuitive at first
An equatorial mount does not move up/down and left/right as you expect — it follows the rotation of the sky. Users consistently report that it takes several sessions before it begins to feel natural.
Collimation: the skill nobody mentions in the listing
The mirrors go out of alignment with use. Stars look bloated rather than sharp when this happens. Users report that a Cheshire eyepiece makes collimation straightforward once learned, but most beginners don't discover they need it until their second or third month.
Omegon
Omegon Advanced 203/1000 EQ4
Mount axes feel counterintuitive at first
An equatorial mount does not move up/down and left/right as you expect — it follows the rotation of the sky. Users consistently report that it takes several sessions before it begins to feel natural.
Collimation: the skill nobody mentions in the listing
The mirrors go out of alignment with use. Stars look bloated rather than sharp when this happens. Users report that a Cheshire eyepiece makes collimation straightforward once learned, but most beginners don't discover they need it until their second or third month.
Not a spontaneous telescope
At 19kg total, this goes out when you plan to go out — not for a quick look on a clear evening.
Which is right for you?
Two different buyers. Two different right answers.
The sky-learner's equatorial scope
Omegon · Omegon Advanced 150/750 EQ3
You’ll love this if…
- You want to understand how an equatorial mount works — and you're prepared to spend a few sessions on polar alignment before it becomes second nature
- You plan to observe from a fixed spot in the garden, where the mount can stay roughly polar-aligned between sessions
- Astrophotography is on your radar even if you're not starting there — this mount keeps that option open with a motor drive upgrade
This will frustrate you if…
- You find the equatorial mount's axes feel wrong — objects move in unexpected directions and polar alignment adds a step each session that takes several outings to become automatic
- You notice that stars look bloated rather than sharp and don't know why — users report this is usually a collimation issue that's straightforward to fix once you know about it, but the listing doesn't mention it
The sky-learner's equatorial scope
Omegon · Omegon Advanced 203/1000 EQ4
You’ll love this if…
- You want to understand how an equatorial mount works — and you're prepared to spend a few sessions on polar alignment before it becomes second nature
- You plan to observe from a fixed spot in the garden, where the mount can stay roughly polar-aligned between sessions
- Astrophotography is on your radar even if you're not starting there — this mount keeps that option open with a motor drive upgrade
This will frustrate you if…
- You find the equatorial mount's axes feel wrong — objects move in unexpected directions and polar alignment adds a step each session that takes several outings to become automatic
- You notice that stars look bloated rather than sharp and don't know why — users report this is usually a collimation issue that's straightforward to fix once you know about it, but the listing doesn't mention it
- You want to take it out for spontaneous sessions — at this weight, getting it in and out of a car on your own requires planning and ideally a second pair of hands
Our verdict
The Omegon Advanced 150/750 EQ3 is designed to get a new observer to the eyepiece quickly with minimal friction. The Omegon Advanced 203/1000 EQ4 assumes you already know what you want from the sky, or are genuinely willing to put in the learning time.
If this is your first telescope, buy the Omegon Advanced 150/750 EQ3. You'll spend a year learning what you actually want, and those lessons are cheaper at £279. The Omegon Advanced 203/1000 EQ4 is the scope to buy when you've outgrown your first one and know exactly why you want it. If I had to choose for a first-time buyer: the Omegon Advanced 150/750 EQ3.
Omegon Advanced 150/750 EQ3
View Omegon Advanced 150/750 EQ3 →Omegon Advanced 203/1000 EQ4
View Omegon Advanced 203/1000 EQ4 →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 | Omegon Advanced 150/750 EQ3 | Omegon Advanced 203/1000 EQ4 |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 150mm | 203mm |
Focal Length Longer = more magnification potential | 750mm | 1000mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/5 | f/4.9 |
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 and SiO2 overcoat |
How do you point it?
| Spec | Omegon Advanced 150/750 EQ3 | Omegon Advanced 203/1000 EQ4 |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Equatorial | Equatorial |
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 | Omegon Advanced 150/750 EQ3 | Omegon Advanced 203/1000 EQ4 |
|---|---|---|
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 | Rack and pinion | Dual-speed Crayford |
Size & weight
| Spec | Omegon Advanced 150/750 EQ3 | Omegon Advanced 203/1000 EQ4 |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 5.1kg | 8.5kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 12.5kg | 19kg |
Tube Length | 710mm | 900mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Omegon Advanced 150/750 EQ3 | Omegon Advanced 203/1000 EQ4 |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 10mm and 25mm eyepieces | 10mm and 25mm eyepieces |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | 6x30 finder scope | 8x50 finder scope |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Omegon Advanced 150/750 EQ3 advantage · Amber highlight: Omegon Advanced 203/1000 EQ4 advantage · Greyed cells: equal or subjective.