Celestron StarSense Explorer DX 130AZ Smartphone App-enabled Newtonian Reflector Telescope

Product Overview

The Celestron StarSense Explorer DX 130AZ is a 130 mm f/5 Newtonian reflector with a parabolic primary, on a manual altazimuth mount and aluminium tripod, paired with a smartphone dock and Celestron's StarSense Explorer app. The app reads the actual star field through your phone's camera and matches it against its own catalogue to work out where the tube is pointed, then shows on-screen arrows that walk you to a target and turn the bullseye green once it is centred in the eyepiece. With 650 mm of focal length and 345 times the light-gathering power of the unaided eye, it is the most aperture in the range on a full-height tripod.

Who It's For

This is a good match if you want reflector light-gathering at standing height rather than on a table, and you would rather spend the evening observing than learning to star-hop first. The 130 mm aperture reaches a 13.1 limiting magnitude, which brings clusters, the brighter nebulae and the nearer galaxies within range, and the dual-axis slow-motion controls make following them at magnification straightforward. It suits a backyard observer who wants one telescope that handles both the planets and deep sky.

Key Features & Design

• 130 mm parabolic primary at f/5: 650 mm focal length, with a highest useful magnification of 307x, a lowest useful magnification of 19x and a limiting stellar magnitude of 13.1.
• 345x the light-gathering power of the unaided eye: more than the 102 mm refractor's 212x, which is what the extra aperture buys.
• Parabolic rather than spherical primary: it keeps stars tight to the edge of the field instead of softening off-axis.
• Two eyepieces supplied: a 25mm at 26x and a 10mm at 65x, giving a wide finding view and a closer look in the box.
• Glass mirrors coated with aluminium and SiO2 in a steel tube 635 mm (25") long.
• Dual-axis slow-motion controls: fine adjustment on both axes, which is what makes following an object at 307x practical on a manual mount.
• Aluminium tripod to 1244.6 mm (49") with an accessory tray, supplied preassembled with the mount.
• 18 lb (8.16 kg) complete, with an 8.8 lb optical tube.

Optical / Mechanical Design

The optical tube is a 130 mm parabolic Newtonian at f/5 in a steel tube 635 mm (25") long. Celestron publishes its resolving power as 1.07 arcseconds by the Rayleigh criterion and 0.89 arcseconds by the Dawes limit — enough to split a good many double stars and to show the Cassini division on a steady night.

The parabolic primary is the specification worth noting at this price. A spherical mirror at f/5 would not bring the whole field to a common focus, and stars would soften noticeably away from centre; a parabola does. Like every Newtonian, it is collimated by the owner rather than sealed at the factory — at f/5 that is a forgiving job and holds once set. The tube is the same optical configuration as the 130mm tabletop model in this range; the difference is the mount, which here is a full-height tripod with geared slow-motion controls rather than a base that needs a table.

Recommended Uses

Deep-sky observing of open and globular clusters, the brighter nebulae and the nearer galaxies at a 13.1 limiting magnitude. Lunar observing in detail and planetary observing at up to 307x. Double-star work near the 0.89 arcsecond Dawes limit. Guided touring with the app's list of currently visible objects and its audio descriptions. Backyard and suburban observing at standing height, with no table or platform needed. Outreach and family observing, where the app lets anyone find something themselves.

Compatibility and Accessory Notes

Eyepieces: the focuser takes 1.25" eyepieces. The supplied 25mm and 10mm cover 26x and 65x; a 6mm or a zoom is the usual next addition for planetary work, with a 307x ceiling above.

Solar: we stock the Celestron EclipSmart Solar Filter that fits this telescope, which mounts over the front of the tube.

Smartphone: the StarSense Explorer app runs on Android 12 and later and on iOS 18 and newer, including iPhone XR and newer. Celestron maintains the full device list at starsenseexplorer.simcur.com.

Mount: the tube ships on its own manual altazimuth mount and tripod, preassembled. It is a visual mount with no tracking drive and no provision for adding one.

If you are unsure whether your phone will run the app, send us the model and we will check it against Celestron's list before you order.

Good to Know Before You Order

The app needs real starlight to work. It cannot orient itself in daylight and wants roughly an hour after sunset before there is enough star detail to match on. Cloud cover, haze, a bright Moon and heavy light pollution all reduce what it can lock onto.

It shows tonight's sky only. There is no date or time control in the app, so it plans the session you are about to have rather than one next month.

Tracking is manual. Objects drift across the field as the Earth turns, and the dual-axis slow-motion controls are how you follow them — a turn of a knob rather than nudging the tube.

It is a Newtonian, so it wants collimation. At f/5 it is an undemanding job and it holds once set. Ask us if you would like a collimation tool recommendation to go with it.

A Newtonian gives a mirror-reversed view, which is normal for astronomy and makes it unsuited to terrestrial daytime use. If you want a telescope that does both, the DX 102AZ refractor in this range ships with an erect-image diagonal.

Solar observing needs a purpose-made filter — the EclipSmart filter linked above is the matched one.

Two-year Celestron warranty.

Frequently Asked Questions

Is it difficult to set up?

No. The mount and tripod arrive preassembled, the tube goes on, an eyepiece goes in the focuser and the phone goes in the dock. Aligning the phone to the optics is a short procedure at the start of each session and the app's tutorials walk through it. Collimation is the one technical job, it is forgiving at f/5, and it holds once set.

Does the app need a subscription?

No. The app is unlocked for use with the telescope, with nothing further to pay.

Which phones does it work with?

Android 12 and later, and iOS 18 and newer including iPhone XR and newer.

How does this differ from the 130mm tabletop Dobsonian?

The optics are the same configuration — 130 mm parabolic at f/5, 650 mm, 345x light-gathering, 307x ceiling. What differs is the mount. This one stands on a 49" tripod with geared slow-motion controls and weighs 18 lb; the tabletop is 19.2 lb, needs a table or its optional tripod, and is moved by hand rather than by knobs.

How does it compare with the DX 102AZ refractor?

This gathers 345x the unaided eye against the refractor's 212x and reaches a 13.1 limiting magnitude against 12.5, so it shows more deep sky. The refractor never needs collimating, gives higher contrast per inch, and works by day. Different strengths at a similar price.

Can I use it for astrophotography?

It is built as a visual instrument. The mount is manual with no tracking drive, so long-exposure imaging is outside what it does. Short-exposure lunar and planetary work held up to the eyepiece is practical.

Bottom Line

A 130 mm f/5 parabolic Newtonian on a full-height altazimuth tripod with app-guided pointing: 650 mm of focal length, a 307x useful ceiling, a 13.1 limiting magnitude, dual-axis slow-motion controls and 18 lb complete. The most light-gathering in the range that stands on its own legs.