Officina Stellare 800mm f/3.8 RiFAst Astrograph - Standard Optics - Aluminum-Carbon Tube

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Officina Stellare 800mm f/3.8 RiFAst Astrograph - Standard Optics - Aluminum-Carbon Tube


Officina Stellare 800 RiFAst Astrograph

with Low Expansion Optics and Aluminum/Carbon Truss

Officina Stellare is one of today's leaders in the production of high quality astronomy equipment for the discerning professional or advanced amateur. Their products can be found in observatories around the world, and their high speed tracking lens systems are a relied upon component in the industries of aerospace and defense.

One of the reasons Officina Stellare is so popular today is because they listen to their customers. In fact, the RiFAst series of astrographs was created because customers asked for a fast telescope (even faster than Officina's RiLA models) with a very wide, corrected field of view. They wanted something that didn't weigh a ton, but that would accept all of the imagers, rotators, focusers, guiders, and other equipment that makes up the imaging train used by today's astronomer.

Once Officina Stellare decided they would make this dream telescope a reality, they put Italian optical designer, Massimo Riccardi, on the job. Riccardi wanted to create a telescope that had the following characteristics:

  • It had to be a fast system.
  • The design needed to be compact and lightweight for its aperture.
  • It would have the least number of surfaces possible while still producing a large corrected field.
  • The secondary obstruction would be as small as possible.

These features were made a reality and then some with the creation of the Officina Stellare RiLA and RiFAst series. The design, which is a modification of the Harmer-Wynne, has an aspherical primary and a spherical secondary. A special corrector is placed just before focus.

The Officina Stellare 800 RiFAst Astrograph has a large aperture of 31.5" and a fast f/3.8 focal ratio. The low expansion optics are housed in a carbon fiber/aluminum open truss tube, and there are Losmandy style dovetails mounted on the truss for mounting versatility. Three ventilation fans are part of the design, which helps the telescope reach ambient temperature as quickly as possible. The mirrors can be heated to keep dew at bay, and depending on the package or accessories you choose, most everything can be electronically controlled via the TC-1.


Officina Stellare 800mm f/3.8 RiFAst Highlights


  • Aperture: 800mm (31.5")
  • Glass: Low Expansion Borosilicate
  • Focal Ratio: f/3.8
  • Focal Length: 3040mm
  • Truss: Carbon/Aluminum Truss Tube Design
  • Easy Alignment: Specially designed mirror cells and spherical secondary are easy to align. Primary cell is detachable for easy cleaning of the mirror.


This RiFAst Package Includes


  • 31.5" Astrograph with Low Expansion Optics and a Carbon/Aluminum Open Truss
  • Two Dovetails
  • Three Ventilation Fans
  • Manual Control on Both Mirrors
  • Manual Movement of Secondary Mirror
  • TC-01 Electronics
  • Black Fabric Shroud
  • Caps/Covers


Aperture800 mm (31.5")
Back Focus240mm
Corrected Image Circle80mm
Dawes Limit0.15 arcseconds
Focal Length3040 mm
Focal Ratiof/3.8
Hightest Magnification1600x
Light Gathering Power13061x
Limiting Magnitude18.3
Optical DesignHarmer Wynne
RMS Spot Size8.4 microns
Tube Diameter590mm
Tube Length915mm
Tube Weight396.8 lbs


Ask a Question
  • What is the weight of this incredible thing? Is it suitable for 10micron GM4000 mount?

    According to the manufacturer, the weight of this 800mm scope is ~220 kg (~485 lbs). The GM4000 is rated for 150 kg (330 lbs), so it is not large enough to support the RiFaST 800.