Celestron RASA 6" Rowe-Ackermann Schmidt Astrograph OTA

Meet the Celestron RASA 6 (Rowe-Ackermann Schmidt Astrograph), a compact powerhouse engineered to deliver spectacular astrophotography performance without sacrificing portability. Designed around an exceptionally fast f/2.2 optical system, the RASA 6 brings the speed and imaging capability of the RASA family into a smaller, more travel-friendly package. Whether you're traveling to remote dark-sky locations or upgrading your backyard astrophotography setup, the RASA 6 gives you the flexibility to capture stunning astronomical images wherever inspiration strikes. Its compact design makes it easier to transport while maintaining the high-performance optical characteristics expected from the RASA platform. From dedicated astrophotographers seeking a portable imaging system to enthusiasts looking to expand their imaging capabilities, the RASA 6 opens up new possibilities for capturing the night sky.

RASA Performance for Everyone

For astrophotographers who demand speed, precision, and convenience in a compact package, the 6” RASA is the ultimate tool. Its f/2.2 design dramatically shortens exposure times, making it easier to capture crisp, detailed images of faint deep-sky objects without the heavy burden of extended tracking. Since RASA technology debuted in 2014, it has become the trusted choice for space surveillance and satellite tracking, relied upon by defense contractors, professional researchers, and governments alike. Like its bigger brothers, RASA 6 features a flat field for sharp stars from edge to edge. With RASA 6, you get the same technology trusted by the pros, but at a price that’s within reach for most, including those looking to add a second grab-and-go astrograph to their arsenal. RASA 6 defies the limitations of smaller and slower instruments. It collects more light and provides higher resolution than the refractors in its price range, allowing you to capture faint details in galaxies, nebulae, and star clusters in less time.

Shorter Exposures for a “Near-Real Time” Experience

The magic of RASA 6 is in its speed. Its blazing f/2.2 optics mean that even faint objects can be imaged in short exposures. When paired with sensitive cameras and live-stacking software on your laptop, you can create an almost real-time imaging experience. Bright, detailed images appear on your laptop screen in just a few short exposures. The system’s ultra-fast focal ratio also eases the tracking demands on your mount. Since it allows using much shorter sub-exposures, you won’t need to use an autoguider in many instances, so you’ll spend less time dealing with equipment and more time exploring the universe.

RASA Optical Design: Engineering Excellence

The patented Rowe-Ackermann Schmidt optical design sets RASA 6 apart from other systems. This design features:

• A Schmidt corrector and a high-precision primary mirror that work in tandem to minimize optical aberrations.
• A specialized three-element lens group using rare-earth glass, which ensures that more of the light emitted from celestial objects is sharply focused onto your sensor.
• A removable 2” clear filter – engineered to maintain peak F/2.2 performance when you add a filter, as no extra glass is added into the light path.
• StarBright XLT coating system for all refractive and reflective surfaces, guaranteeing maximum light transmission and superior field illumination.
• The RASA optical design provides better overall performance and field illumination than a Schmidt-Cassegrain in the Fastar-style configuration.
• Can be used with sensors up to 22mm diagonal to provide a wide 3.8° while delivering sub-arcsecond resolution.

Features

• Lightning-Fast Imaging: RASA’s legendary ultra-fast f/2.2 optics let you capture deep-sky images with briefer sub-exposures and less total exposure time —often eliminating the need for autoguiding.
• Mobile But Mighty: Weighing just 8.4 lb and featuring a versatile CG-5 dovetail, the RASA 6 is ready to image wherever you are.
• Sub-Arcsecond Potential: With advanced optics capable of sub-arcsecond resolution, RASA 6 perfectly pairs with a high-resolution camera and favorable sky conditions to reveal fine structures in galaxies and nebulae.
• Expansive Field of View: Designed for sensors up to 22mm diagonal, RASA 6 offers a generous 3.8° view that effortlessly frames wide celestial targets.
• Maximized Light Throughput: Celestron’s proprietary XLT coatings ensure every image bursts with brightness and contrast.
• Convenience & Customization: With built-in features like a filter drawer and cooling fan—and optional upgrades—RASA 6 adapts to your evolving astroimaging needs.