Celestron RASA 6" Rowe Ackermann Schmidt Astrograph, OTA

Celestron 6" Rowe-Ackermann Schmidt-Astrograph - fast Deep-Sky Photo Telescope

Meet the Rowe-Ackermann Schmidt Astrograph (RASA) 6 - a compact powerhouse that delivers spectacular astroimages, anywhere. Make spectacular wide field images with high resolution and ultra-short exposure time.

Engineered with ultra-fast f/2.2 optics, the smallest member of the RASA family proves that you don´t have to sacrifice performance for portability. Whether you´re chasing dark skies in remote locations or elevating your backyard setup, RASA 6 opens the door to new possibilities.

The 6" RSA is optimized for astro cameras like the ones from ZWO. The astrograph is not suitable for normal system cameras (DSLR or mirrorless), as their flange focal distance is too long.

Most important features of the 6" f/2.2 RASA:

The RASA provides a fully corrected image field with 16 mm diameter. Up to 22 mm, a drop in performance is only noticeable in the corners.

Due to extremely short exposure times, using an autoguider becomes unnecessary in most cases.

A built-in fan speeds up cooling down, thus the RASA becomes fully operational after relatively short time.

The primary mirror is held by stable roller bearings, so unintentional readjustment is excluded. Now focusing is more accurate and simple than ever before.

The RASA 6" is designed for astro cameras up to 17.5 mm flange focal distance. An adapter to T2 is included in the scope of delivery. Coarse tuning is done with T2 adapters from Teleskop-Service, fine tuning with the built-in focusing system.

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 22 mm diagonal to provide a wide 3.8° while delivering sub-arcsecond resolution.

Advanced Features & Versatility
Designed with the modern astroimager in mind, RASA 6 is loaded with features that enhance usability and adaptability.

Built-in Filter System: The integrated filter drawer accepts both 1.25" and 2" filters, giving you the flexibility to use various imaging filters. The removable 2" clear filter (i.e. optical window) allows you to add optional filters if desired, without introducing additional glass into the optical path that could compromise performance at f/2.2.

Integrated Cooling System: A 12 V MagLev fan pulls air through mesh vents to rapidly cool the system to the ambient temperature to provide best images while keeping internal components dust-free.

M42 Camera adapter: The included camera adapter for the RASA 6 features standard M42 threads, making it easy to mount a wide variety of astronomical CMOS cameras.

Enhance your setup: To achieve the highest level of performance, we strongly recommend pairing this telescope with the Focus Motor, 6" Dew Shield, 6" Dew Ring, and 6" RASA bag (all sold separately). The Focus Motor allows you to achieve sharp, precise focus electronically from the same computer used to control your camera. For dew prevention during long imaging sessions, the dew shield or dew ring will help keep your optics clear, especially in humid conditions. When your telescope is not in use, store your RASA in this protected, portable, grab-and-go case.

A Universe of Possibilities in a Compact Package
The 6" RASA offers the perfect blend of speed, precision, and portability. Its game-changing optical design and robust mechanical features empower you to capture the night sky like never before. Embrace a grab-and-go astrograph that opens up a big, boundless universe.

- RASA6 OTA
- Vixen style dovetail bar
- Dust cover
- Battery holder
- Filter holder
- Filter holder with 2? clear glass filter (pre-installed in filter compartment)
- 1.25? filter adapter
- Camera adapter (connected to filter compartment)
- Locking ring (connected to filter compartment)

Safety informations: PDF Download