Astrograph Telescope Celestron RASA 8"

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Capturing stunning deep sky images is now easier than ever thanks to new astrograph ROWE-ACKERMAN SCHMIDT from CELESTRON. This telescope is the perfect companion for today's astronomical CCD cameras or the most advanced DSLRs. This Rowe-Ackerman Schmidt system is fast, and captures a large field thanks to its short f/2.2 focal ratio. It offers two major advantages mainly when compared to a typical f/10 system: on the one hand it has better apparent tracking and on the other hand it allows you to work with much shorter exposures. That means that you will be able to obtain higher quality images with much less working time and you will even do so without the need to use guiding systems.

The Rowe-Ackerman Schmidt astrograph telescope builds on the legacy left by the popular Schmidt camera from Celestron, which enabled astrophotographers to obtain images on film in the 1970s.

Nowadays, with sensors that have CCD cameras (of which you have a good assortment in Telescopiomania) that equal or even exceed the size of film, you can take advantage of the full flat field offered by the Rowe-Ackerman. You will have fully spotted stars from the optical axis to the peripheral areas of the largest sensors on the market. Combine this large flat field capability with a focal length of 400mm and you have a telescope ideal for wide field astrophotography that will allow you to create huge mosaics of the night sky, or engage in comet hunting, etc.

OPTICAL PERFORMANCE.

The Rowe-Ackerman Schmidt Astrograph features a new optical design with a 4-element system made of pure glass that is rarely found on Earth and allows for images totally free of chromatic aberrations and field curvature. The optical quality and "spot size" across the entire field of view is unprecedented in an astrograph telescope in this price range (or even in more expensive tubes). This design also minimizes the risk of vignetting.

Capture spectacular wide-field deep sky images in seconds with the new handheld astrograph from Celestron, schmidt's 8" Rowe-Ackermann Astrograph (RASA). This incredibly fast, f/2.0 system is the perfect companion for today's astronomical color CMOS cameras, smaller CCD cameras and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, it can capture sharp, detailed images. If necessary, the system can skip autoguiding altogether. Weighing only 7.71 kg, it is easy to transport your 8" RASA to the most remote dark-sky locations.

The 8" RASA is a telescope that offers flat field images without optical aberrations of stars, with great sharpness over a wide field of view. It can capture stunning deep sky astronomical images without the challenges normally presented by longer focal length instruments at a fraction of the cost of those systems.

The latest addition to the RASA family is this 8" version, a much more portable and affordable version of the highly acclaimed RASA 11. The main focusing focal plane is located at the front of the optical system, so a traditional eyepiece cannot be used.

Shorter exposure times, and real-time virtual observation.Since it is an F/2.0 optical system, images can use shorter exposure times to capture details on faint objects. When combined with sensitive cameras and the right "live stacking" software, the 8" RASA can provide a near real-time observing experience. See images on your PC instantly, brighter and more detailed than can be seen on much larger telescopes with the naked eye.

Because shorter exposure times are possible, your equatorial mount will not need to track accurately for extended periods. The relatively short 400 mm focal length of the RASA also reduces equatorial tracking demands. In many cases, autoguiding will not be necessary. Weighing only 7.71 kg, this optical tube pairs perfectly with a wide variety of mounts.

With the launch of the 8" RASA, Celestron features a new focusing design that mitigates lateral movement of the primary mirror when focusing, rotating or tracking with the astrograph. Focusing is easier, more accurate and more stable than ever before. The key to the ultra-stable focusing system is two sets of precision bearings that are precisely aligned and checked during assembly to ensure optimal results.

An advanced feature of the Rowe-Ackerman Schmidt is that it incorporates a brass in-line bearing focuser finished with the FeatherTouch Micro Focus for fine focus (macro/micro) and maximum image quality. On the other hand, a 12V MagLev fan helps the tube to reach thermal equilibrium earlier by providing the optimum laminar airflow that passes through a filter to prevent dust from entering the tube.

Designed with an engineering mindset and with the goal of making a complete astrophotography system, every component of the Rowe-Ackerman Schmidt astrograph has been optimized to perform at the highest level in combination with astronomy CCD cameras.

Unlike the larger RASA's that work with DSLR and large CCD cameras, the 8" model has been designed for astronomical color CMOS cameras, smaller CCD cameras and mirrorless cameras. The telescope does not work with standard DSLR cameras. It is optimized for sensors up to 22 mm diagonal, but works well with sensors up to 32 mm diagonal. The APS-C size sensors used in many mirrorless cameras are a good choice. Full-frame 42 mm sensors will also work, but performance will be poor at the edges of the sensor and field illumination will be reduced. Also, we do not recommend pairing the RASA 8 with any camera body larger than 4" in diameter.

General Characteristics:

• • • • 203mm diameter, f/2 focal ratio optical system with 4 elements made of rare earth glass to eliminate chromatic aberration, coma or field curvature.
      • Flat field to provide point stars from the optical axis to the peripheral area of the field of view even for the largest CCDs.
      • Linear focuser with brass bearings to reduce image shifting, while incorporating the Dual Speed with 10:1 FeatherTouch Micro reduction Focus for high-precision focusing.
      • Silent 12V MagLev fan that helps to thermalize the tube in less time and blocks the entry of dust.
      • Common camera adapters (T and M48 thread) included for easy attachment to popular DSLR and CCD cameras.
        

Technical Specifications:

• • • • Optical Design: Rowe-Ackermann Schmidt
      • Diameter: 203 mm
      • Focal length: 400 mm
      • Focal ratio: 2
      • Backfocus from front lens mount: 25 mm
      • Backfocus from camera adapters included: 29 mm
      • Central obstruction diameter: 93 mm
      • Search engine: NOT INCLUDED
      • Light gathering power (compared to the human eye): 843x
      • Optical Coating: StarBright XLT
      • Total weight of the optical tube: 7,7Kg.
      • Ultra-stable engoque
      • Optical window: 46 mm
      • Dovetail CGE