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Officina Stellare - Pro RC 320 Sitall PREMIUM Package

Model#: PRC320PRE

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Availability: In stock


Manufactured by: Officina Stellare


Officina Stellare Pro RC 320 Sitall Premium

Premium Package Includes:

  • FLI Atlas Focuser
  • Astrodon MMOAG Off-Axis Guider
  • Optec 3" Pyxis Rotator
  • Custom Adapter to CCD

Move over Ritchey Chrètien designers... There's a new kid on the block and its name is Officina Stellare!    

The Officina Stellare Ultra CRC 320 telescope is a premier design. An ultra corrected Ritchey Chrètien telescope that features a unique and innovative primary cell design that includes a three fan ventilation system. Its beautiful zero expansion carbon fiber open truss tube body is trimmed with CNC aluminum fittings.

The Ultra CRC Series Ritchey Chrétien telescope made by Officina Stellare are built around the best quality optics today available. All optical sets are realized under precise quality requirement conditions, using the highest renewed standards in terms of quality of the materials being used and the production processes involved. Each optical set is provided with its own interferometry report stating and certifying the overall quality to the customer. In the making of the optics, Officina Stellare only use blanks of certified origin and perfect homogeneity. They offer, as a standard, very high reflectivity protected aluminizings and multi layer anti reflex coatings. It is possible to make special coatings (silver, gold etc.) for specific wavelength related needs. In addition, there is an in house, pneumatically insulated, 6 meters long and 500 Kg weight optical bench using a Zygo mark IV interferometer with phase shifter coupled with a highly sophisticated analysis software for producing extremely precise measurements and tests. Officina Stellare verifies each and every one of their instruments before delivery to the final user. 

The materials Officinia Stellare uses in their premium quality telescopes are mostly aluminum and carbon fiber because of their lightness, their mechanical and thermal properties and for the optimal resistance to environmental conditions. 

Officina Stellare telescope aluminum carbon fiberAll the mechanical parts for the the Pro RC 320 OTA telescope are manufactured and equipped using CNC computer assisted machines and from a whole block of aluminum to guarantee the best possible precision. Officina Stellare also provides carbon fiber components that are produced following strict specification and tolerances. Each part has been computer designed and optimized for the best structural performance, rigidity and lightness. The holding systems for both mirrors, the spider, rings and all the structural components, even the smallest, are CNC machined from a single block of special aluminum (6061/7075, Ergal and Anticorodal), stainless steel, titanium and brass. The tubes are made of true carbon-graphite fiber obtained with the use of high vacuum process, allowing the observor to obtain the best stability of the focus vs temperature changes still maintaining the best structural rigidity and lightness. 

 Officina Stellare ensures that superior care is taken in the making of the rear holding cell of the primary mirror. The hyperbolic shaping combined with the diameter and relative weight of the mirror, imposes a very careful study and design for the holding system in order not to introduce any astigmatism, mirror flop or shift in the system. The primary mirror in the Pro RC 320 telescopic models are fixed in a multi-point cell of innovative design that holds it linearly in the center and radially on the borders in order to distribute the weights, for any given position, in an optimal way. In the large rmirror (starting from 16”) we add an extra reinforcing plate in the back of the mirror and even more holding points, up to 27, optimally distributed using computer based optimization methods; this in order to give an even more increased stability factor to the whole system. The entire rear cell for the primary mirror is figured to have the best rigidity/weight ratio and for the fastest possible thermal stabilization between the environment and mirror. The convection and thermal irradiation are greatly improved with the use of three high quality axial fans in the back of the cell. 

Ultra CRC 360 telescope quality opticsOne aspect Officina Stellare has implemented and designed in their Ritchey Cretien telescopes has been to apply to simplify the collimation between the mirrors resulting in a stable, efficient but easy to use system. Officina Stellare has accomplished this by acting on just three points (the minimum required points to generate a single plane) using a special, great diameter preloaded bolts (one for each point). This results in a single hand use, simply turn the bolt left or right to move the mirror back and forth (no more complicated operations using push pull screws and locks) in a very intuitive way. Finding the correct positions is a snap. The mirror borders uses an opaque, circular mask to avoid any undesired light scattering. The light shields for the primary and secondary mirrors are computer designed and optimized to ensure complete illumination of the field still maintaining a complete protection from stray light. Inside the light shields there are also micro baffles that reduces, coupled with an opaque painting of the surfaces, to nearly zero any possible parasite stray light. In some cases and for particular applications, the light shield for the secondary mirror is made using a special layout that maintain the efficiency of the system while reducing the obstruction for the system. The back plate of Officina Stellare's telescopes comes standard with a system for adjusting the planarity of the focal plane in order to compensate for any small misalignment in the imaging train, always unwanted and annoying specially on today’s large CCD cameras. One that is highly recommended is the Apogee U9000 camera with the Kodak KAF-9000 chip.

Ultra CRC 360 optics telescope designThe Ultra Corrected Ritchey Chretien is an Officina Stellare exclusive optical scheme. Developed for highest photography performance and the highest efficiency of light transfer to focal plane, with only two hyperbolic mirrors and two spaced elements back group. The Officina Stellare Ultra CRC Series true carbon fiber/aluminum compound structure is designed and optimized with CAD and computer support modelling to achieve the best rigidity and lightness. The truss configuration made by using high vacuum production process, top quality and zero expansion carbon fiber tubes guarantee the greatest focus stability. Only special lightweight aluminum/Ergal alloy, stainless steel and brass metals are used. All parts are full CNC machined to guarantee the best possible precision. 


Officina Stellare Ultra Corrected Ritchey Chrètien 320 Telescope Mechanical Detalls...

  • State of art construction: full CNC machined aluminum parts and ultra rigid true carbon truss structure.
  • Computer designed and optimized, two stage, secondary mirror light shield for minimal obstruction.
  • Large focus extraction to allow the use of every imaging train.
  • Easy piggy pack of guiding or ancillary equipment thanks to standard four dovetail bar structure.







Additional Information

Name Officina Stellare - Pro RC 320 Sitall PREMIUM Package
Manufacturer Officina Stellare
Model PRC320PRE
Aperture 320mm
Diameter 320mm (12.5)
Focal Length 2560mm
Focal Ratio F/8
Included Accessories OTA, FLI atlas focuser, Optec Pyxis rotator, Astrodon MMOAG off-axis guider, STL cameras adapter
Optical Design Ritchey-Chrétien Telescope with Low Exp. or Sitall glass
Optical Tube Length 910mm
RMS Spot Size 1.4 microns @ 26mm