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Officina Stellare - Pro RC 500 PRO Package

Model#: PRC500PRO

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Manufactured by: Officina Stellare


Officina Stellare Pro Ritchey Chrètien 500 LT Telescope

PREMIUM Package Includes:

  • FLI Focuser
  • STL Cameras adapter
  • Optec Pyxis Rotator
  • Astrodon MMOAG off axis-guider
  • O.S. ATC-02 electronic with secondary mirror motorized actuator

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

The Officina Stellare Pro RC 500 LT/ST telescope is a premier design 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 truss tube body is trimmed with CNC aluminum fittings. 


The Pro RC Series Ritchey Chrétien telescopes 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. The materials can be chosen between a wide range, varying from borosilicate to Pyrex to Sitall and other low expansion ceramic type glasses. 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 RC telescopes are mostly aluminum and carbon fiber because of their lightness, their mechanical and thermal properties and for the optimal resistance to environmental conditions. They offer to their customers the two classical configuration options for the OTA, the closed tube (aluminum or carbongraphite tube) and the most requested carbon-graphite open truss configuration. In this last case, the combination between the near zero thermal expansion values of the optics (if produced with Sitall or other ceramics) and the carbon-graphite truss of the structure between the two mirrors, guarantees the most stable and fixed position and focus vs temperature variations thus simplifying the imaging operations. 

All the mechanical parts for the the Pro RC 500 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 500 OTA telescopic model is 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. 

One aspect Officina Stellare has implemented and designed in their Pro RC 500 Ritchey Cretien telescope 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 the Pro RC 500 telescope 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.

The Officina Stellare Pro RC 500 LT/ST telescope has a clear aperture of 500 mm and operates at a focal length of 4000 mm with an f/8 focal ratio. Its mirror system features LK7 optical glass for LT model and Sitall for ST model and an interferometric report can be provided for each and every telescope. The over all length of the Officina Stellare Pro RC 500 LT/ST optical train assembly measures 1530 mm (slightly over 60 inches) and its over all average weight is 85 Kg - or about 187 pounds with an average tube diameter 665 / 700 mm - or 26 to 27.5 inches. The spot size for the Officina Stellare Pro RC 500 LT/ST telescope at 26mm from axis with optional flattener is 8 microns. 

Officina Stellare Product Number: PRC500OTA 



The advantages of the Ritchey-Chrétien telescopes are very well known. It’s the most widely used optical scheme by professional astronomers and astroimagers all over the world. The Hubble space telescope itself uses the RC configuration. PRO RCs by Officina Stellare represent a step forward in state of the art professional instruments in the Ritchey Chretien spectrum. The PRO RC 500 design is a four element combination of hyperbolic mirrors and two elements lens system designed by the most experienced optical engineers with the objective of providing outstanding astronomical performances. The use of four optical elements results in a superb optical quality, suited for the most demanding astroimagers and professional use. Maximum light transmission, widest spectral range and a highly corrected large field are the features of the PRO RC design. The telescopic series cover edge to edge even the largest CCD with the smallest spot size available on the market. Without the flattener lens group (which is easily user removable), and thanks to the versatility of the highly corrected hyperbolic design, the professional scan work anyway with an all reflective system, with increased light transmission and the widest possible spectral range. Thanks to its perfect mechanics, superb certified optics, top level accessories line and our superior customer service, we give you the most powerful tool to take images of the sky with unsurpassed quality.


The Officina Stellare PRO RC Series are built around the bestquality true Ritchey-Chrétien optical sets available today. Alltelescopes are provided with its own interferometric report,stating and certifying the overall quality to the customer. Ourstandard range goes from 250 mm (10 inches) to 600 mm (24inches), and we offer both low expansion glass or near zero expansionSitall ceramic glass substrate options.



The Officina Stellare PRO RC Series carbon fibre/aluminum compound structure is designed and optimized with CAD and computer support modelling to achieve the best rigidity and lightness. Full CNC machined parts to guaranteethe best possible precision.Only special aluminum alloy, stainless steel, titanium and brass metals are used. High resistance anodization or multilayerpaint for unbeatable resistance to environmental conditions. Unique and innovative design of both primaryand secondary mirror holding cells. Absolutely no astigmatism is induced on the mirrors and the absence of mirrorshift or flop is guaranteed. Fastest possible thermal stabilization time, thanks to the mechanical design of cells andto the presence of three high quality fans. Simple to use, efficient and absolutely rock solid collimation system. Fullattention to constructive details: computer designed baffles, focal plane tilt adjusting, large focus extraction, highprecision spherical joint in the truss structure, double parallel split ring for the secondary mirror/spider support, radialmicrometric adjusting of spider, manual or motorized zero shift secondary mirror movement, special opaque paint for all optical path sensible parts.


Main accessories:

AT C-02 Advanced Telescope Controller (6 inches LCD display, full digital mirrors temperature close loop control, fansspeed control, dew point, environmental probe, stand alone or PC control, full SCOM compliant, and more) - F/6 reducer/flattener optical groups - Secondary mirror servo focusing system - Focal plane focusers - Primary mirror motorizedcovering system - Fly and transport cases - Finder scopes - Piggy back supports - Professional customer servicefor imaging train parts optimization, design and realization.

Additional Information

Name Officina Stellare - Pro RC 500 PRO Package
Manufacturer Officina Stellare
Model PRC500PRO
Aperture 500 mm
Diameter 500mm (20")
Focal Length 4000 mm
Focal Ratio F/8
Optical Design Ritchey-Chrétien Telescope with Low Exp. or Sitall glass
Optical Tube Carbon truss tube CNC aluminum
Optical Tube Length 1530mm
Size 2.2 microns RMS spot size @ 26mm