
Refractor · Beginner
Celestron AstroMaster 90AZ
A lightweight alt-az refractor that favors easy handling, clean planetary contrast, and quick backyard observing.
- Aperture
- 90mm
- Focal ratio
- f/11
- Mount
- Alt-Az
- GoTo
- Manual

Achromat · Alt-Az
Ultra-light refractor built for quick trips, travel, and daytime spotting
Price in India
₹12,000
A grab-and-go 70mm refractor with backpack portability, upright daytime views, and minimal setup friction.
The Travel Scope 70 is designed for portability first: a light optical tube, compact tripod, erect-image diagonal, and included backpack make it easy to bring astronomy along on road trips, hikes, and family outings.
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
100× the human eye
Compared to a dark-adapted 7mm pupil. This is what determines how faint an object you can detect.
Resolving power
1.66 arcseconds
The Dawes limit for this aperture — the finest detail the optics can theoretically separate.
Limiting magnitude
~11.7
The faintest star reachable under a genuinely dark sky. Expect two to three magnitudes worse from a city.
Maximum useful magnification
140×
Twice the aperture in millimetres. Atmospheric conditions usually impose a lower practical limit.
Magnification with 25mm eyepiece
16×
Your low-power, wide-field view — used for finding objects and framing large clusters.
Magnification with 10mm eyepiece
40×
The workhorse range for planets, lunar detail and globular clusters.
The optical ceiling for a 70mm aperture is about 140x. On a typical Indian night, atmospheric seeing — not the telescope — limits you to roughly 150x–200x. Most of your observing will happen between 16x and 40x, and the view will be brighter and sharper for it.
Why telescope magnification claims are misleading →No reviews for the Celestron Travel Scope 70 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 reviewSpecifications 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
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Considering more aperture? The Celestron AstroMaster 90AZ is the next step up at 90mm, for ₹25,000.
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