Telescope Comparison
Celestron AstroMaster 70AZ vs Orion AstroView 90mm EQ Refractor
The specs are close. The experience isn't.
First light
Celestron · 70mm · £89
The simple alt-az visual scope
- 70mm refractor on a simple alt-az mount
- Good for: Moon, planets, bright open clusters
- No alignment required — quick to set up, intuitive to move
- Finding objects requires learning to star-hop: navigate with a finder scope and sky chart
- 4.9kg total — manageable to carry to dark-sky sites
Orion · 90mm
The sky-learner's equatorial scope
- 90mm refractor 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
Orion AstroView 90mm EQ Refractor gathers 1.7× 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
Orion AstroView 90mm EQ Refractor's longer focal length reaches higher magnification with the same eyepiece — better reach for planetary detail. Celestron AstroMaster 70AZ's shorter focal length gives a wider true field — better for large open clusters and extended nebulae.
Focal ratio
Orion AstroView 90mm EQ Refractor's faster f/10.1 delivers wider fields with any eyepiece — better for open clusters and large nebulae. Celestron AstroMaster 70AZ's f/12.86 provides more magnification per eyepiece — better for fine planetary detail.
Mount type
Orion AstroView 90mm EQ Refractor's equatorial mount tracks the sky when polar-aligned. Celestron AstroMaster 70AZ's alt-az is simpler to set up but objects drift at high magnification.
Weight (OTA)
Similar optical tube weight. Any portability difference between these setups comes from the mount, not the tube itself.
Optical design
Both are refractors — no mirrors to collimate, good contrast, colour-free stars with ED or APO glass. The differences between them are in aperture, focal ratio, and glass quality.
At the eyepiece
Celestron
Celestron AstroMaster 70AZ
At moderate magnification, Saturn's rings are cleanly separated from the disk. Jupiter shows two equatorial cloud bands and four Galilean moons. The Moon rewards extended sessions at the eyepiece — the terminator is full of crater and highland detail. The Orion Nebula (M42) is bright and structured, the Trapezium straightforward to split. Open clusters are excellent — the Pleiades, the Double Cluster in Perseus, M35 in Gemini. The Andromeda Galaxy (M31) shows a clear bright core. The longer focal ratio gives the sharp, high-contrast images that quality refractors are known for — planetary detail and pinpoint stars with a good eyepiece.
Orion
Orion AstroView 90mm EQ Refractor
At moderate magnification, Saturn's rings are cleanly separated from the disk. Jupiter shows two equatorial cloud bands and four Galilean moons. The Moon rewards extended sessions at the eyepiece — the terminator is full of crater and highland detail. The Orion Nebula (M42) is bright and structured, the Trapezium straightforward to split. Open clusters are excellent — the Pleiades, the Double Cluster in Perseus, M35 in Gemini. The Andromeda Galaxy (M31) shows a clear bright core. The longer focal ratio gives the sharp, high-contrast images that quality refractors are known for — planetary detail and pinpoint stars with a good eyepiece. The Orion AstroView 90mm EQ Refractor gathers 1.7× more light than the Celestron AstroMaster 70AZ — 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 Celestron AstroMaster 70AZ's alt-az mount is faster to set up — no polar alignment, intuitive pointing. The Orion AstroView 90mm EQ Refractor's equatorial mount takes longer but tracks the sky properly when polar-aligned. For quick visual sessions the alt-az is more convenient; for higher-magnification work or any astrophotography, the equatorial mount is the better tool.
The dark side
Every scope has a personality. Here’s where each one gets difficult.
Celestron
Celestron AstroMaster 70AZ
Finding faint objects from a light-polluted garden is genuinely hard
Star-hopping to a globular cluster or dim galaxy from a suburban sky requires learning. Users report a real demoralising phase in the first weeks — landing on the wrong star field, convincing yourself it's the target, then finding out later it wasn't. This improves rapidly with experience.
Orion
Orion AstroView 90mm EQ Refractor
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.
Which is right for you?
Two different buyers. Two different right answers.
The simple alt-az visual scope
Celestron · Celestron AstroMaster 70AZ
You’ll love this if…
- You want the fastest possible setup — no alignment, no polar alignment, just point and look
- Learning the sky by star-hopping feels like part of the appeal, not a barrier to it
- Portability matters — this mount is manageable to carry to a dark-sky site without a car full of equipment
This will frustrate you if…
- You try to find faint objects from a light-polluted garden and mostly fail — users report a real demoralising phase in the first weeks of star-hopping that improves quickly but is genuinely discouraging at the start
The sky-learner's equatorial scope
Orion · Orion AstroView 90mm EQ Refractor
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
Our verdict
At similar price points, these scopes offer different amounts of aperture per pound. The Orion AstroView 90mm EQ Refractor gives you more light-gathering for your money — and for visual observing, aperture per pound is the most useful single metric.
For pure optical value, the Orion AstroView 90mm EQ Refractor is the stronger pick. The Celestron AstroMaster 70AZ compensates with other features — decide whether those trade-offs justify the premium. If I had to choose: the Orion AstroView 90mm EQ Refractor — more aperture per pound means more sky.
Celestron AstroMaster 70AZ
View Celestron AstroMaster 70AZ →Orion AstroView 90mm EQ Refractor
View Orion AstroView 90mm EQ Refractor →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 AstroMaster 70AZ | Orion AstroView 90mm EQ Refractor |
|---|---|---|
Apertureⓘ The most important spec — bigger = more light = better views | 70mm | 90mm |
Focal Length Longer = more magnification potential | 900mm | 910mm |
Focal Ratio Lower f-number = wider field of view; higher = more magnification per eyepiece | f/12.86 | f/10.1 |
Optical Design The type of optics — each design has different strengths | Refractor | Refractor |
Coatings Better coatings = more light transmission through the optics | Fully coated glass optics | Fully multi-coated achromatic doublet |
How do you point it?
| Spec | Celestron AstroMaster 70AZ | Orion AstroView 90mm EQ Refractor |
|---|---|---|
Mount Type The mechanical system that holds and moves the telescope | Alt-Az | 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 | Celestron AstroMaster 70AZ | Orion AstroView 90mm EQ Refractor |
|---|---|---|
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 | Rack and pinion | Rack and pinion |
Size & weight
| Spec | Celestron AstroMaster 70AZ | Orion AstroView 90mm EQ Refractor |
|---|---|---|
OTA Weightⓘ Optical tube only — useful for comparing mount load capacity | 1.8kg | 2.7kg |
Total Weightⓘ Full setup including mount — this is what you lug to the car | 4.9kg | 7kg |
Tube Length | 760mm | 910mm |
Tube Material | Aluminium | Aluminium |
What's in the box?
| Spec | Celestron AstroMaster 70AZ | Orion AstroView 90mm EQ Refractor |
|---|---|---|
Eyepieces Included eyepieces — more is better, but quality matters more than quantity | 20mm and 10mm eyepieces | 25mm and 10mm Sirius Plössl |
Finder Scope Helps you locate areas of the sky before switching to the main eyepiece | StarPointer red dot finder | EZ Finder II red dot |
Diagonal Tilts the eyepiece 90° for comfortable viewing — useful on refractors |
Blue highlight: Celestron AstroMaster 70AZ advantage · Amber highlight: Orion AstroView 90mm EQ Refractor advantage · Greyed cells: equal or subjective.