Celestron RASA 6 Optical Tube Assembly (CGE Dovetail)

Celestron RASA 6 Optical Tube Assembly (CGE Dovetail)

Compact yet powerful, the Rowe-Ackermann Schmidt Astrograph (RASA) 6 delivers breathtaking astrophotography in a portable design. Featuring ultra-fast f/2.2 optics, this smallest member of the RASA family proves that high performance doesn’t require a bulky setup. Whether you’re traveling to remote dark-sky sites or enhancing your home observatory, the RASA 6 unlocks new imaging possibilities.

Professional Performance, Portable Design

Built for astrophotographers who value speed, precision, and convenience, the RASA 6 is an ideal grab-and-go imaging solution. Its f/2.2 focal ratio significantly reduces exposure times, letting you capture faint galaxies, nebulae, and star clusters with remarkable clarity–without the need for hours of long tracking.

Since its introduction in 2014, RASA technology has become a trusted choice for satellite monitoring, space surveillance, and advanced research, used by defense contractors and observatories worldwide. Now, the RASA 6 brings this same cutting-edge optical performance into an affordable, portable package for enthusiasts and professionals alike.

Compared to smaller refractors in its price range, the RASA 6 collects more light and delivers higher resolution, enabling you to reveal fine cosmic details in a fraction of the time.

Ultra-Fast Imaging for Near Real-Time Results

The magic of the f/2.2 system is its incredible speed. Even dim objects can be recorded in short exposures, and when combined with sensitive CMOS cameras and live-stacking software, the RASA 6 can provide an almost real-time view of the universe. Bright, detailed images begin to appear on your screen within minutes.

Because shorter exposures reduce mount tracking demands, the RASA 6 often eliminates the need for an autoguider—allowing you to spend less time managing equipment and more time capturing the sky.

Advanced Rowe-Ackermann Optical Design

   ➜  The patented Rowe-Ackermann Schmidt system sets this telescope apart. Its key features include:

   ➜  Precision Schmidt corrector + primary mirror to minimize optical distortions.

   ➜  Three-element lens group with rare-earth glass for pinpoint star quality.

   ➜  Removable 2” clear filter (optical window) designed to preserve peak f/2.2 performance when using imaging filters.

   ➜  StarBright XLT coatings on all optical surfaces for maximum light transmission.

   ➜  Wide field of view up to 3.8°, supporting sensors up to 22mm diagonal with sub-arcsecond resolution.

   ➜  Unlike Schmidt-Cassegrains with Fastar-style systems, the RASA delivers superior field illumination and image sharpness across the frame.

Modern Features for Today’s Astrophotographer

The RASA 6 is equipped with thoughtful engineering to enhance usability and adaptability:

   ➜  Integrated filter drawer – Accepts both 1.25” and 2” filters, with a removable clear filter included.

   ➜  Cooling system with MagLev fan – Quickly stabilizes the optics while keeping dust out.

   ➜  M42 camera adapter – Standard threading for easy connection to popular CMOS imaging cameras.

   ➜  For the best results, pair the RASA 6 with dedicated accessories:

   ➜  Focus Motor for precise, computer-controlled focusing.

   ➜  Aluminum Dew Shield or Dew Ring to prevent moisture buildup during long sessions.

   ➜  Custom 6” RASA bag for safe storage and easy transport.

Big Performance in a Small Package

The RASA 6 redefines what a compact astrograph can achieve. With its ultra-fast optics, advanced design, and robust mechanical features, it combines portability with professional-level imaging capability. Whether you’re starting your astrophotography journey or adding a versatile second instrument, the RASA 6 is a gateway to capturing the universe in vivid detail.