**Sirius Optics is still open for business. As the situation is changing on a daily basis, check our website for the most up to date information.**

Visit this page for updates on the measures we are taking to combat COVID-19.

Starting Monday 27th April we will be introducing new shop hours and will open from 10am to 5.30pm Monday to Friday and from 9am to 2pm Saturdays. Closed Sundays.

Celestron Astro Fi 5 Cassegrain

Celestron Astro Fi 5 Cassegrain

Regular Price: AUD $1,195.00

Special Price AUD $999.00

Availability: In Stock

  • 125 mm f/10 Schmidt-Cassegrain, perfect for viewing the Moon, planets, and some deep sky objects.  The large 125mm aperture offers incredible resolution, and the long focal length provides amazing views of the planets and Moon

  • Once aligned, the motorized Go-To mount automatically points to and tracks celestial objects of your choice using the Celestron SkyPortal app

  • Using SkyAlign Technology, it's easy to align the telescope by simply centering any three bright stars in the sky

  • No hand controller required! Just use your smartphone or tablet which connects to the telescope via wifi

  • Full height, adjustable aluminum tripod provides a stable platform for viewing

  • The accessory tray holds 2 x 1.25” eyepieces, miscellaneous accessories, including a rubber-lined area for a smart phone or small tablet

  • Free SkyPortal app available; gives full control of the telescope and allows you to find and view objects quickly

OR Download PDF


Celestron is not only changing the way we experience astronomy, but we're also changing the way you interact with the night sky. The Astro Fi 5 Schmidt-Cassegrain is a fully featured telescope that can be controlled with your smart phone or tablet using the free Celestron SkyPortal app. Celestron’s SkyPortal app replaces the traditional telescope hand control for a 100% wireless experience. Just hold your smart device up to the night sky. When you find an object you’d like to view, tap the screen. Your Astro Fi telescope automatically slews to the object, while the screen displays information about it. It’s never been more fun to explore the universe!

The Astro Fi 5 creates its own wireless connection, so it can communicate with your device even in remote locations where WiFi or cellular networks aren’t available. Getting ready to observe is quick and painless thanks to Celestron’s award-winning SkyAlign technology. Center any three bright objects in the eyepiece, and your telescope calculates its position. You can even generate a Sky Tour of all the best celestial objects to view based on your exact time and location.


Innovative WiFi technology powers the Astro Fi, but it’s the optics inside the telescope tube that make it a Celestron. This 125mm Schmidt-Cassegrain with fully coated optics offers dazzling views of craters on the Moon, the rings of Saturn, the Great Red Spot on Jupiter, the Orion Nebula, the Hercules Globular Cluster and so much more.

Additional Information

Optical Design Schmidt-Cassegrain
Aperture (mm) 125 mm
Focal Length 1250 mm
Focal Ratio 10
Eyepieces 25 mm Kellner – 1.25” (50x)
  10 mm Kellner – 1.25” (125x)
Finderscope StarPointer
Mount Type Single Arm Computerized Alt-Azimuth
Tripod Aluminium
Power Requirements 8-AA batteries (not included)
Highest Useful Magnification 295x
Lowest Useful Magnification 18x
Limiting Stellar Magnitude 13
Resolution (Rayleigh) 1.11arc seconds
Resolution (Dawes) 0.93 arc seconds
Light Gathering Power (Compared to human eye) 329x
Optical Coatings Fully Coated
Optical Tube Length 13"
Max Slew Speed 3º/second
Tracking Rates Sidereal, Solar and Lunar
Communication Ports Aux port for optional hand control
Included Items/Accessories: 25 mm Kellner Eyepiece, 10 mm Kellner Eyepiece, StarPointer Finderscope, 1.25” Star Diagonal, Battery Pack

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.