Celestron LT 127AZ Reflector 300x Black Silver 16.5cm Optical Tube

The Celestron LT 127AZ Reflector combines a 127 mm (5") Newtonian optical tube with StarSense Explorer technology to simplify manual stargazing. The telescope uses your smartphone and the StarSense app to identify the telescope's pointing in real time and guide you to celestial targets. The kit includes an altazimuth mount with a slow-motion altitude control and an adjustable full-height aluminum tripod. With a 127 mm objective and high-quality optics you can observe planets, bright deep-sky objects and star clusters. The system is lightweight and portable for use at home, in the city, or at darker observing sites.

Advantages

StarSense Explorer turns a smartphone into a sky-recognition device that matches star patterns and calculates the telescope’s exact orientation, enabling faster and more accurate object finding than apps that rely only on phone gyros. The simple altazimuth mount with a sliding slow-motion rod provides precise manual tracking, while the 127 mm aperture delivers bright, sharp views of planets, lunar detail and many deep-sky objects. The complete kit is compact and lightweight, making it convenient to transport to different observing locations.

Suitable for

• Beginner and hobbyist astronomers learning the night sky
• Observers who prefer a manual, portable telescope
• City dwellers who want to view bright planets and prominent nebulae
• Weekend stargazers taking equipment to darker sites or camping trips

When it may not be suitable

This Newtonian reflector on an altazimuth mount is intended for visual observing and manual tracking; it is not designed for advanced astrophotography that requires long exposure tracking or an equatorial mount. Users seeking very high magnification on faint deep-sky objects may find the 127 mm aperture limiting compared with larger telescopes.

Key specifications

• Aperture: 127 mm (5")
• Optical design: Newtonian reflector
• Focal ratio and focal length: (not specified in source)
• Maximum stated magnification: up to 300x (manufacturer guidance)
• Mount type: Altazimuth with altitude slow-motion control
• Tripod: Adjustable full-height aluminum tripod
• Weight (complete kit): approximately 4 kg (11.4 pounds for the full kit)
• Smartphone compatibility: most iPhone 6 and newer; most Android devices from 2016 running Android 7.1.2 or later

How to use

Set up the adjustable tripod on level ground and attach the optical tube to the altazimuth mount. Place your smartphone into the StarSense dock and launch the StarSense Explorer app. Follow the brief alignment procedure to align the phone to the telescope optics (a quick, approximately 2-minute process). After calibration the app will identify visible celestial objects and display onscreen arrows directing how to move the telescope; the bullseye indicator will turn green when the object is centered in the eyepiece. Use the altitude slow-motion control to fine-tune the telescope’s pointing and make manual adjustments as objects drift across the sky.

What to consider before purchase

• Requires a compatible smartphone and the StarSense Explorer app for automated sky recognition
• Not intended for long-exposure astrophotography without additional mounts and equipment
• Aperture size (127 mm) limits faint-object performance compared with larger telescopes
• Ensure you have suitable eyepieces and any accessories you want, as only the telescope kit is included

Usage recommendations

For best results, use the telescope from a darker observing site to increase the number of visible deep-sky objects; in light-polluted urban areas focus on bright planets, the Moon and prominent nebulae. Keep the StarSense app and your phone’s operating system updated to maintain compatibility.