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Celestron AstroMaster 90AZ refractor telescope

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Achromat · Alt-Az

Celestron AstroMaster 90AZ

Long-focus refractor with simple controls and crisp lunar views

Price in India

₹25,000

Price exclusive of GST. GST (18%) is added at checkout.

  • Free shipping across India
  • In stock
  • Setup and first-light guidance over WhatsApp

A lightweight alt-az refractor that favors easy handling, clean planetary contrast, and quick backyard observing.

Not sure how big it will look? See it at real-world scale in your own space.

Ask an astronomer before you buy
Aperture
90mm
Focal length
1000mm
Focal ratio
f/11
Mount
Alt-Az

See the Celestron AstroMaster 90AZ in your room

Stand it on a sample balcony, or in a photo of your own space. We have not published measured dimensions for this telescope yet, so the size shown here is indicative rather than exact.

About the Celestron AstroMaster 90AZ

The AstroMaster 90AZ emphasizes simple operation with a pan-handle mount, fully coated optics, and a forgiving refractor design that suits beginners who value convenience and low maintenance.

Absolute beginnersLunar observingPlanetary sessionsEasy balcony use

Full specifications

Brand
Celestron
Model
AstroMaster 90AZ
SKU
NS-005
Optical design
Achromat
Telescope type
Refractor
Aperture
90 mm
Focal length
1000 mm
Focal ratio
f/11
Mount type
Alt-Az
Computerised GoTo
No — manual
Recommended level
Beginner
Best suited to
Planetary

Why this telescope

  • 90mm refractor design is easy to maintain and great for Moon and planets.
  • Long focal length supports higher magnification sessions with good control.
  • Pan-handle alt-az mount feels intuitive for first-time users.
  • No-tool setup keeps the barrier low for spontaneous observing.

In the box

  • 20mm eyepiece
  • 10mm eyepiece
  • Erect-image diagonal
  • StarPointer red-dot finderscope
  • Adjustable tripod and mount

Optical performance, in plain terms

Every figure below is calculated from this telescope's own specifications using standard optical formulae. None of it is a marketing number.

Light-gathering power

165× the human eye

Compared to a dark-adapted 7mm pupil. This is what determines how faint an object you can detect.

Resolving power

1.29 arcseconds

The Dawes limit for this aperture — the finest detail the optics can theoretically separate.

Limiting magnitude

~12.3

The faintest star reachable under a genuinely dark sky. Expect two to three magnitudes worse from a city.

Maximum useful magnification

180×

Twice the aperture in millimetres. Atmospheric conditions usually impose a lower practical limit.

Magnification with 25mm eyepiece

40×

Your low-power, wide-field view — used for finding objects and framing large clusters.

Magnification with 10mm eyepiece

100×

The workhorse range for planets, lunar detail and globular clusters.

About magnification claims

The optical ceiling for a 90mm aperture is about 180x. On a typical Indian night, atmospheric seeing — not the telescope — limits you to roughly 150x–200x. Most of your observing will happen between 40x and 100x, and the view will be brighter and sharper for it.

Why telescope magnification claims are misleading →

What you'd actually see

The Moon, two planets and a nebula through the Celestron AstroMaster 90AZ, drawn from its own aperture and focal length rather than from a photograph taken through something bigger.

Through the eyepiece at 40×, to scale

At 40×, the whole Moon fits in the eyepiece, spanning about 41% of the field.

At 90mm aperture

  • Dark maria, bright highlands and the larger craters
How we calculated this
Magnification: 40×
1000 mm focal length ÷ 25 mm eyepiece = 40×
True field of view: 1.25°
50° apparent field ÷ 40× = 1.25°
How big it looks: 20.72°
31′ across × 40 = 20.72° — 41% of the 50° field
Resolving power (Dawes limit): 1.29″
116 ÷ 90 mm = 1.29″ — the finest detail the optics can separate in perfect air
Limiting magnitude: 12.3
7.5 + 5 × log₁₀(9 cm) = 12.3 — the faintest star under a truly dark sky
Light grasp: 165×
(90 mm ÷ 7 mm pupil)² = 165× your dark-adapted eye
Smallest crater you could pick out: ≈ 2.8 km
the larger of 1.29″ (resolving power) and 60″ ÷ 40× = 1.50″ (what your eye resolves at this power), × 1.864 km per arcsecond at the Moon's distance

Magnification uses the same 25mm (Moon, nebula) and 10mm (planets) reference eyepieces as the specifications above. Which features appear is not a formula: each is shown from the aperture at which our own guides say it becomes visible. Star positions and crater positions are illustrative; how many appear follows the limiting magnitude and resolving power.

Illustration of a typical view under a dark sky. City skies and atmospheric conditions will show less.

Customer reviews

No reviews for the Celestron AstroMaster 90AZ yet. We publish reviews only from people who actually bought the telescope from us, so this section stays empty until there is something real to put in it.

Own this telescope? Send us your review

Celestron AstroMaster 90AZ — common questions

What can I see with the Celestron AstroMaster 90AZ?
With 90mm of aperture you will see lunar craters and mountain ranges in sharp relief, Saturn's rings clearly separated from the planet, Jupiter's cloud belts and its four Galilean moons, and the phases of Venus. Deep-sky objects are more limited at this aperture — expect the Orion Nebula as a distinct misty patch and bright open clusters such as the Pleiades resolved into individual stars, rather than detailed galaxy structure.
What magnification does the Celestron AstroMaster 90AZ support?
The optical ceiling for a 90mm aperture is about 180x. With the 1000mm focal length, a 25mm eyepiece gives 40x and a 10mm eyepiece gives 100x. In practice, atmospheric conditions over most Indian cities limit useful magnification to roughly 150x–200x, and the majority of your observing will happen between 40x and 100x where the image is brightest and sharpest.
Is the Celestron AstroMaster 90AZ suitable for beginners?
Yes. It is rated for first-time owners: the mount is steady enough to hold a target while you focus, and the supplied eyepieces give sensible rather than inflated magnifications. The alt-azimuth mount moves up-down and left-right, which needs no learning at all.
Does the Celestron AstroMaster 90AZ need collimation?
No. Refractor optics are sealed and fixed, so there is nothing to align. This telescope performs the same on its five hundredth night as on its first, with no maintenance beyond keeping it dry and dust-free.
Can I do astrophotography with the Celestron AstroMaster 90AZ?
Only in a limited way. Smartphone photographs of the Moon through the eyepiece work well, and short lunar exposures are achievable. Deep-sky astrophotography requires a precision equatorial mount with autoguiding, which this telescope does not have.
What is included with the Celestron AstroMaster 90AZ?
In the box: 20mm eyepiece, 10mm eyepiece, Erect-image diagonal, StarPointer red-dot finderscope, Adjustable tripod and mount. We recommend budgeting for one good mid-power eyepiece and a red torch, which together improve your observing more than any other purchase at this price.
How much does the Celestron AstroMaster 90AZ cost in India?
₹25,000 through Nakshatra Scopes, shipped nationwide. We include first-setup and first-light guidance over WhatsApp so the telescope is working before you are left alone with it.

Where these specifications come from

Specifications on this page are taken from Celestron's official product documentation. Derived figures — magnification, resolving power, limiting magnitude — are calculated from those specifications using standard formulae, and observing expectations reflect what this aperture realistically delivers under Indian skies.

View the manufacturer's official listing

Similar telescopes

Considering more aperture? The Celestron PowerSeeker 114EQ is the next step up at 114mm, for ₹18,000.

Before you decide

The guides and comparisons most relevant to this telescope.

ComparisonCelestron AstroMaster 90AZ vs 130EQBuy the 90AZ if you value simplicity and mainly observe the Moon and planets; buy the 130EQ if you want the most capability and are willing to learn collimation and an equatorial mount.ComparisonCelestron Travel Scope 70 vs AstroMaster 90AZBuy the 90AZ as your main telescope; buy the Travel Scope 70 if portability is the actual requirement or as a second grab-and-go instrument.GuideHow to Choose a TelescopeMost telescope advice starts with specifications. That is backwards. Start with where you observe and what you want to see, and the right telescope narrows down fast.GuideTelescope Aperture ExplainedAperture is the single specification that sets the ceiling on what a telescope can show you. Here is what each step up actually buys, in objects rather than millimetres.GuideWhat Can You See Through a Telescope?The single biggest source of disappointment in amateur astronomy is expecting Hubble. Here is what a real telescope shows a real eye, and why that is still extraordinary.CategoryBeginner telescopesEvery beginner telescopes we stock, with the trade-offs of the category explained.