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Celestron 8 inch Rowe-Ackermann Schmidt Astrograph

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Für weitere Info hier klicken. Artikel: Celestron 8 inch Rowe-Ackermann Schmidt Astrograph
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Für weitere Info hier klicken. Artikel: Celestron 8 inch Rowe-Ackermann Schmidt Astrograph
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Drag mouse over image for larger view
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  • RASA 8 inch Rowe-Ackermann Schmidt Astrograph
  • 8-inch f/2.0
  • flat image field, free of optical errors such as field curvature, coma, astigmatism and chromatic aberration over the entire field of an APS-C sensor
  • ultra-stable focusing system - six sealed precision ball bearings prevent image shifting
  • integrated air cooling system - 12V DC MagLev fan with dust protection reduces cooling time and ensures optimum airflow
  • internal filter holder - integrates a light pollution filter seamlessly into the light path
  • CGE dovetail prism rail (3 inch Losmandy standard)
  • extended spectral range from 390-800 nm, allowing a brighter overall signal to be recorded

RASA 8 inch - Rowe-Ackermann Schmidt Astrograph
The transportable astrograph from Celestron, the 8 inch Rowe-Ackermann Schmidt Astrograph (RASA), can capture spectacular deep-sky wide-field images in seconds. This incredibly fast f/2.0 system is the perfect telescope for modern astronomical CMOS color cameras, smaller CCD cameras and mirrorless cameras.

Thanks to the large focal ratio and patented optical design, you can produce sharp, detailed images and in many cases completely dispense with an autoguider. With a weight of only 7.7 kg (17 pounds), it is easy to transport the 8 inch RASA to even the most remote locations.

RASA performancefor everyone
The 8 inch RASA is a telescope designed purely for photography, providing a flat field of view without optical aberrations and thus showing extremely sharp stars over a large field of view. It provides astronomical images with impressive "depth" and avoids the problems typically associated with longer focal length (and slower focal ratio) instruments.

The latest addition to the RASA family, the 8-inch aperture is a much more portable and affordable version of the RASA 11, which was launched to great acclaim in 2014. With the 8-inch RASA, the benefits of the RASA design are now available to a wider range of astrophotographers. It shares many features with its "big brother" RASA 11, including the integrated cooling system, the internal filter holder and the robust CGE dovetail mount.

The 8-inch RASA is designed exclusively for photography and cannot be used visually. The focal plane is located at the front of the optical system, so the telescope cannot accommodate a conventional eyepiece.

Shorter exposure times and virtual "real-time" observation
Because it is an f/2.0 optical system, astrophotographers can use shorter exposure times to capture details in faint objects. In combination with sensitive cameras and the right "live stacking" software, near-live observations are also possible with the 8" RASA: you can view and stack the images on a computer instantly, making them brighter and more detailed than with the naked eye - even compared to much larger telescopes!

As shorter exposure times are possible, your mount does not have to track with high precision over longer periods of time. The relatively short focal length of 400 mm of the 8 inch RASA further reduces the tracking requirements. In many cases, autoguiding is not necessary. With a weight of only 7.7 kg (17 pounds), this telescope fits perfectly with a variety of commercially available mounts.

Ultrastable Focusing System
With the introduction of the 8 inch RASA, Celestron introduces a new focusing mechanism that reduces the backlash of the primary mirror when focusing, slewing or tracking the astrograph. Focusing is easier, more accurate and more stable than ever. The key to this ultra-stable focusing system is two groups of precision bearings that are precisely aligned and tested during assembly for optimal results.

Unique optical design
The patented RASA design (US 2016/0299331 A1) consists of Schmidt plate, primary mirror, lens group and optical window. The lens group consists of four elements and uses rare earths. Unlike many other telescopes, which only perform well in visible light (400-700nm), the 8-inch RASA is designed for a wider spectral range, from 390-800 nm. This allows more light from celestial objects to be collected and imaged sharply.

With many optical systems, it is irrelevant for the imaging quality whether an additional flat glass such as a filter is used. With extremely fast systems such as the RASA, the situation is different. Our developers have solved this problem by providing the RASA with an optical window that can be removed and replaced with a filter. This means that the image quality remains at the highest level even if you use a filter or the camera has its own optical window. Celestron offers a filter against light pollution which was specially developed for the 8" RASA and which replaces the optical window.

All refractive optical surfaces are StarBright-XLT-coated, the primary mirror has an improved aluminum coating. This ensures high transmission for the entire system. Compared to the HyperStar system for Schmidt-Cassegrains, the RASA 8 delivers better optical performance and superior illumination.

Developed for the most modern cameras
In contrast to the larger RASAs, which are optimized for DSLR and large CCD cameras, the 8-inch model was developed for astronomical CMOS colour cameras, smaller CCD cameras and mirrorless cameras. The telescope does not work with standard DSLR cameras due to the available back focus. It is optimized for sensors with a diagonal of up to 22 mm and still offers good performance on sensors with a diagonal of up to 32 mm. The APS-C format sensors used in many mirrorless cameras are a good choice. 42mm full-frame sensors also work in principle, but performance at the edges of the sensor is poor and field illumination is reduced. In addition, we do not recommend combining the RASA 8 with a camera body with a diameter of more than 10cm.

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Celestron 8 inch Rowe-Ackermann Schmidt Astrograph

Short profile

  • RASA 8 inch Rowe-Ackermann Schmidt Astrograph
  • 8-inch f/2.0
  • flat image field, free of optical errors such as field curvature, coma, astigmatism and chromatic aberration over the entire field of an APS-C sensor
  • ultra-stable focusing system - six sealed precision ball bearings prevent image shifting
  • integrated air cooling system - 12V DC MagLev fan with dust protection reduces cooling time and ensures optimum airflow
  • internal filter holder - integrates a light pollution filter seamlessly into the light path
  • CGE dovetail prism rail (3 inch Losmandy standard)
  • extended spectral range from 390-800 nm, allowing a brighter overall signal to be recorded

Product description for Celestron 8 inch Rowe-Ackermann Schmidt Astrograph

RASA 8 inch - Rowe-Ackermann Schmidt Astrograph
The transportable astrograph from Celestron, the 8 inch Rowe-Ackermann Schmidt Astrograph (RASA), can capture spectacular deep-sky wide-field images in seconds. This incredibly fast f/2.0 system is the perfect telescope for modern astronomical CMOS color cameras, smaller CCD cameras and mirrorless cameras.

Thanks to the large focal ratio and patented optical design, you can produce sharp, detailed images and in many cases completely dispense with an autoguider. With a weight of only 7.7 kg (17 pounds), it is easy to transport the 8 inch RASA to even the most remote locations.

RASA performancefor everyone
The 8 inch RASA is a telescope designed purely for photography, providing a flat field of view without optical aberrations and thus showing extremely sharp stars over a large field of view. It provides astronomical images with impressive "depth" and avoids the problems typically associated with longer focal length (and slower focal ratio) instruments.

The latest addition to the RASA family, the 8-inch aperture is a much more portable and affordable version of the RASA 11, which was launched to great acclaim in 2014. With the 8-inch RASA, the benefits of the RASA design are now available to a wider range of astrophotographers. It shares many features with its "big brother" RASA 11, including the integrated cooling system, the internal filter holder and the robust CGE dovetail mount.

The 8-inch RASA is designed exclusively for photography and cannot be used visually. The focal plane is located at the front of the optical system, so the telescope cannot accommodate a conventional eyepiece.

Shorter exposure times and virtual "real-time" observation
Because it is an f/2.0 optical system, astrophotographers can use shorter exposure times to capture details in faint objects. In combination with sensitive cameras and the right "live stacking" software, near-live observations are also possible with the 8" RASA: you can view and stack the images on a computer instantly, making them brighter and more detailed than with the naked eye - even compared to much larger telescopes!

As shorter exposure times are possible, your mount does not have to track with high precision over longer periods of time. The relatively short focal length of 400 mm of the 8 inch RASA further reduces the tracking requirements. In many cases, autoguiding is not necessary. With a weight of only 7.7 kg (17 pounds), this telescope fits perfectly with a variety of commercially available mounts.

Ultrastable Focusing System
With the introduction of the 8 inch RASA, Celestron introduces a new focusing mechanism that reduces the backlash of the primary mirror when focusing, slewing or tracking the astrograph. Focusing is easier, more accurate and more stable than ever. The key to this ultra-stable focusing system is two groups of precision bearings that are precisely aligned and tested during assembly for optimal results.

Unique optical design
The patented RASA design (US 2016/0299331 A1) consists of Schmidt plate, primary mirror, lens group and optical window. The lens group consists of four elements and uses rare earths. Unlike many other telescopes, which only perform well in visible light (400-700nm), the 8-inch RASA is designed for a wider spectral range, from 390-800 nm. This allows more light from celestial objects to be collected and imaged sharply.

With many optical systems, it is irrelevant for the imaging quality whether an additional flat glass such as a filter is used. With extremely fast systems such as the RASA, the situation is different. Our developers have solved this problem by providing the RASA with an optical window that can be removed and replaced with a filter. This means that the image quality remains at the highest level even if you use a filter or the camera has its own optical window. Celestron offers a filter against light pollution which was specially developed for the 8" RASA and which replaces the optical window.

All refractive optical surfaces are StarBright-XLT-coated, the primary mirror has an improved aluminum coating. This ensures high transmission for the entire system. Compared to the HyperStar system for Schmidt-Cassegrains, the RASA 8 delivers better optical performance and superior illumination.

Developed for the most modern cameras
In contrast to the larger RASAs, which are optimized for DSLR and large CCD cameras, the 8-inch model was developed for astronomical CMOS colour cameras, smaller CCD cameras and mirrorless cameras. The telescope does not work with standard DSLR cameras due to the available back focus. It is optimized for sensors with a diagonal of up to 22 mm and still offers good performance on sensors with a diagonal of up to 32 mm. The APS-C format sensors used in many mirrorless cameras are a good choice. 42mm full-frame sensors also work in principle, but performance at the edges of the sensor is poor and field illumination is reduced. In addition, we do not recommend combining the RASA 8 with a camera body with a diameter of more than 10cm.

Celestron 8 inch Rowe-Ackermann Schmidt Astrograph

Optik
Brennweite
40 cm
Lichtstärke f/
2,0
Vergrößerung
ohne Angabe
Abmessungen und Gewicht
Gewicht ca.
7,7 kg
Sonstiges
Farbton
schwarz
weiß
Lieferumfang
Im Lieferumfang
Die Ware wird mit dem Zubehör ausgeliefert, das vom Hersteller als zum Lieferumfang gehörend angegeben wird.
EAN and KAN KAN
EAN
4047825040343
KAN
822252

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