Maksutov 102mm catadioptric telescope with fully coated glass optics

Control your telescope via built-in WiFi using the free Celestron SkyPortal app for iPhone, iPad and Android devices

See in no time with quick and easy setup, no tools

Accessories included: two eyepieces (25mm and 10mm), 90º diagonal, finder, and a NEW integrated smartphone adapter.

Height adjustable tripod with accessory tray.

receive it in usually 5 to 7 days


All about the Celestron  ASTRO FI 90 GOTO AZ telescope

Control your telescope using your smart device. The Astro Fi series broadcasts its own wireless connection to Celestron's SkyPortal app to provide easy remote observation. Celestron's SkyPortal app replaces traditional telescope manual control for a 100% wireless experience. Scan the sky for an object you would like to see, tap the object in the SkyPortal, and watch your Astro Fi telescope automatically pan toward the object. As you watch, SkyPortal provides information about the object; Exploring the universe has never been more fun!

NOTE: Due to the amount of information SkyPortal has to offer, we recommend downloading the application before going out to observe.

SkyAlign technology

Preparing to observe is quick and easy thanks to Celestron's award-winning SkyAlign technology. Center any of the three bright objects in the eyepiece and your telescope will calculate its position. You can even generate a Sky Tour of the best celestial objects to see based on their exact time and location.

Accessories included

The Astro Fi 90 comes with two eyepieces (25mm and 10mm), a 90 ° diagonal, an integrated smartphone adapter, and a red dot finder. The two eyepieces offer different magnifications to view the desired object. The diagonal allows for a corrected view and a more comfortable viewing angle for looking up at the night sky. The red dot finder will help you quickly center an object in your eyepiece for easier observation.

Lens Cap / Smartphone Adapter - Image celestial or terrestrial objects with this smartphone adapter! The Astro Fi lens cap has a built-in smartphone adapter to capture great images of the Moon, planets, and terrestrial targets such as birds and wildlife. With its rigid and lightweight frame, this accessory allows you to connect any smartphone to any telescope eyepiece with an outer diameter of 45mm or less. This smartphone adapter easily installs over the top of an eyepiece, while elastic cables hold your phone securely in position so you can take pictures or videos. While the vast majority of smartphones can be used with the case on, some very large and / or bulky phone cases (such as folio cases) may need to be removed for the phone to fit into the adapter.

Starry Night Software

Download Celestron's Starry Night software and learn about the night sky, celestial objects, and how to plan your next observing session. Celestron Starry Night software is the premier astronomy software suite on the market, providing resources and insight to see our solar system and beyond..


Optical Design Maksutov-Cassegrain 

Opening 102mm (4.02 ")

Focal length 1325mm (52.17 ")

Focal ratio f / 13

Eyepiece Focal Length 1 25mm (0.98 ")

Eyepiece magnification 1 53 times

Eyepiece 2 focal length 10mm (0.39 ")

Eyepiece magnification 2 132x

Finder StarPointer ™ Red Dot Finder

Diagonal Star  1.25 "Diagonal Star 

Optical tube Aluminum

Highest useful magnification 241x

Lowest useful magnification 15 times

Limit stellar magnitude 12.5

Resolution (Rayleigh) 1.37 arc seconds arc seconds

Resolution (Dawes) 1.14 arc seconds arc seconds

Light gathering power (compared to human eye) 212x

Secondary mirror obstruction 35mm (1.38 ")

Secondary mirror obstruction by diameter 34%

Secondary mirror obstruction by area 12%

Optical Coatings Fully Coated

Optical tube length 381 mm (15 ")

Optical Tube Diameter 117mm (4.6 ")

Optical Tube Weight 6 lbs. (2.7 kg)

Fit Dovetail Bar CG-5


Mounting Type Altitude-Azimuth Computerized Single Fork Arm

Instrument load capacity 8 lbs. (3.6 kg)

Height adjustment range (includes stand and tripod) 863.6 mm - 1371.6 mm (34 "- 54")

Tripod Leg Diameter 31.75mm (1.25 ") Aluminum

Mount Head Weight 5 lbs. (2.3 kg)

Accessory tray Yes. Includes rubber mount for smartphone or tablet

Tripod Weight 5 lbs. (2.3 kg)

Rotation speeds Up to 3 ° / second

Tracking rates Sidereal, solar and lunar 

tracking modes  Alt-Az, EQ North and EQ South 


Dovetail Compatibility CG-5 Dovetail

Number of auxiliary ports 2x auxiliary port for optional accessories

Self-guided port No

USB port No (only with optional Nexstar + remote control)

power requirements 12V DC, 1A (tip positive)

Motor drive DC servo motor

SkyAlign alignment procedures, 3-star alignment, solar system alignment

Periodic correction of errors No

Computerized hand control Hand control not included (optional)

NexStar + Database Optional Nexstar + handheld remote provides more than 40,000 objects in the computer database

Software Celestron Starry Night special edition software, SkyPortal application. Each provides more than 100.00 objects in its database

Total Kit Weight 15 lbs. (6.8 kg)

Included Items OTA Telescope | Mount | Tripod with accessory tray | 2x eyepieces | 1.25 "star diagonal | 1.25" visual reverse | StarPointer ™ Red Dot Finder | Battery bag

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