Officina Stellare 500mm f/3.8 RiFAst Astrograph - Ceramic Glass - Full Carbon Tube

Product Details

• Description
• Specifications
• Included Items
• Recommended Products
• Reviews

•  

  Officina Stellare 500 RiFAst Astrograph

  with Ceramic Glass and Full Carbon Truss Tube

  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 500 RiFAst Astrograph has a 20" aperture and a focal ratio of f/3.8. The near zero expansion ceramic optics are housed in a carbon athermic 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 500mm f/3.8 RiFAst Highlights

   

  • For time frames or questions, please contact us at 800-483-6287.
  • Aperture: 500mm (20")
  • Glass: Ceramic
  • Focal Ratio: f/3.8
  • Focal Length: 1900mm
  • Full Corrected & Illuminated Field: 90 mm
  • RMS Spot Size at 45 mm Off-Axis: 10.08 micron
  • RMS Spot Size at 26 mm Off-Axis: 7.6 micron
  • Back Focus: 180mm
  • Linear Obstruction: 55%
  • Truss: Full Carbon Athermic 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.
  • Diffraction limited: to 11 mm off-axis in the 410 to 750 nm range

   

  This RiFAst Package Includes

   

  • For time frames or questions, please contact us at 800-483-6287.
  • 20" Astrograph with Upgrade Ceramic Optics in a Carbon Athermal 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

• specifications

  Aperture	500 mm (19.75")
  Back Focus	240mm
  Corrected Image Circle	80mm
  Dawes Limit	0.23 arcseconds
  Focal Length	1900 mm
  Freight	Yes
  Highest Magnification	1000x
  Light Gathering Power	5102x
  Limiting Magnitude	17.2
  Optical Design	Harmer Wynne
  RMS Spot Size	8.4 microns
  Secondary Obstruction	275mm
  Tube Weight	187.4 lbs

• included items

  THIS IS A CUSTOM ORDER PRODUCT, ABSOLUTELY NO REFUNDS WILL BE GIVEN AFTER PURCHASE!