Officina Stellare 500mm f/7 RiDK Astrograph with Manual 72mm FineFocuser

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Officina Stellare 500mm f/7 RiDK Astrograph with Manual 72mm FineFocuser
Item # OF-RIDK500SGA
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  • The Officina Stellare RiDK 500 astrograph is a modified Dall-Kirkham created by Officina's talented optical designer, Massimo Riccardi.
  • The RiDK 500 telescope includes an Officina Stellare 72mm manual FineFocus focuser.
  • This 20" f/7 telescope delivers a fully corrected 80mm diffraction limited image across the entire field in the 380 - 2000 nm spectral range.
  • Back focus is 240mm, and the optical tube is made with zero expansion carbon fiber trusses with aluminum primary & secondary holders.
  • The RiDK 500mm OTA package comes with two dovetails, three ventilation fans, manual control and heating of the mirrors, a black fabric shroud, and caps.



Officina Stellare RiDK 500 Astrograph

with 72mm Manual FineFocuser

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.

The RiDK 500 (Riccardi Dall-Kirkham) represents the new reference point for all modified Dall-Kirkham instruments available on the market today. Massimo Riccardi, Chief Optical Designer at Officina Stellare, has the unique experience and creativity required to imagine and build a 500mm astrograph of superior performance and resulting image quality. The RiDK 500 is a system that delivers an 80mm fully corrected, flat field and an imaging performance that is diffraction limited across the entire field over a wide spectral range (380nm to 2000nm). These outstanding optics are mounted inside a state-of-the art Officina Stellare open truss tube made of carbon fiber and aluminum; the same high quality optical tube assembly used in all Officina Stellare open truss-style telescopes the world over.

The Officina Stellare RiDK 500 is manufactured from start to finish in Italy. The optics are made in the Occhiobello Plant under the strict quality control of Massimo Riccardi, Officina's own optical designer. The mechanics of the telescope were designed by Giovanni Dal Lago, and are engineered, manufactured and assembled at the Thiene plant.

The OS RiDK 500 is the ultimate astro-imaging telescope for anyone who desires the best equipment when it comes to the imaging of deep sky wonders. It is a beautiful, compact and perfectly manufactured optical instrument, and the long back focus allows the mounting of rotators, cameras, filter wheels, and other imaging accessories.

The RiDK 500mm comes with a 7" dovetail and a Losmandy D-series dovetail is included on top for accessories. Three ventilation fans are part of the design, which helps the telescope reach ambient temperature as quickly as possible.


Officina Stellare 500mm f/7 RiDK Highlights…

  • Aperture: 500 mm (20")
  • Glass:  low expansion borosilicate
  • Focal Ratio: f/7
  • Focal Length: 3500 mm
  • Linear Obstruction: 48%
  • Full Correct and Illuminated Field: 80mm
  • Back Focus: 240mm
  • OTA Construction: Carbon fiber trusses combined with precision machined aluminum primary and secondary holders.
  • Weight: 85 kg (188 lb.)
  • Dimensions: 660 mm x 570 mm x 1270 mm
  • Diffraction limited across field in 380 - 2000 nm spectral range, near UV to near IR


This RiDK Package Includes…


  • 20" Riccardi Dall-Kirkham Astrograph in Truss Design
  • Two Dovetails
  • Three Ventilation Fans
  • Mirror Heating
  • 72mm FineFocus Manual Focuser
  • Manual Control on Both Mirrors
  • Manual Movement of Secondary Mirror
  • Black Fabric Shroud
  • Caps/Covers
Additional Information

Additional Information

Manufacturer Officina Stellare
Telescope Series Officina Stellare RiDK
Optical Design Astrograph
Mount Type None - Optical Tube Only
Warranty 1 Year Warranty
Glass Type Low Expansion Borosilicate Glass
Telescope Aperture 500mm (19.69 in.)
Telescope Focal Ratio f/7
Telescope Focal Length 3500mm
Optical Tube Weight 188 lb.
Tube Material Aluminum and Carbon
Tube Color or Finish Carbon Fiber
Finder Included None
Focuser Size 72mm (2.83")
Focuser Style Crayford
Manual or Electronic Focusing? Manual
Included Items

Included Items

  • 20" Riccardi Dall-Kirkham Astrograph with Carbon/Aluminum Open Truss
  • 72mm Manual Focuser
  • Two Dovetails
  • Three Ventilation Fans
  • Mirror Heating
  • Manual Control on Both Mirrors
  • Manual Movement of Secondary Mirror
  • Black Fabric Shroud
  • Caps/Covers
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