Celestron 8 203/400 ROWE-ACKERMANN SCHMIDT ASTROGRAPH (RASA 8) OTA (CGE DOVETAIL; SKU: 91073) astography otas and lenses opinie

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Celestron Rowe-Ackermann Schmidt (RASA) 8 "is a professional, ultra-fast (f / 2.0) astrograph designed for taking photographs in a wide field of view with the use of color CCD, CMOS and small mirrorless cameras.

The optical system of this astrograph is a patented construction (patent US 2016/0299331 A1) consisting of a main mirror, a Schmidt corrector and a group of four lenses made of glass with an admixture of rare earth metals. The advantage of this solution is the possibility of obtaining a flat image without optical defects (coma, astigmatism and chromatic aberrations), while maintaining a wide field of view and a very large light (this instrument collects almost 850 times more ¶ light than the human eye). In order to minimize light reflections and to improve the contrast of the image obtained, the lenses were covered with a multilayer StarBright XLT ™ coating, while the main mirror was covered with a reflective layer made of aluminum.

Contrary to other popular telescopes, which show good optical characteristics only for the visible light (400 - 700 nm), the Celestron Rowe-Ackermann Schmidt 8 "astrograph has an extended spectral range, ranging from 400 to 800 nm.

The whole is closed in a durable, aluminum tube equipped with an active cooling system, which significantly improves the process of temperature adaptation, which sometimes takes several hours.

Attention! As the image is captured by a camera placed in the focus of the main mirror, this instrument can only be used in astrophotography. It is not suitable for visual observations.

The most important features of the Celestron Rowe-Ackermann Schmidt 8 "astrograph

• Rowe-Ackermann Schmidt optical system with StarBright XLT ™ coating, providing powerful light and aberration-free field of view covering the entire surface of the APS-C sensor
• built-in holder, allowing the installation of filters that reduce light pollution
• stabilized focusing system equipped with a linear ball bearing
• integrated cooling system accelerating the process of temperature adaptation of the telescope
• dovetail CGE mounting rail

Technical specifications

• optical system: Rowe-Ackermann Schmidt
• aperture: 203 mm / 8 "
• focal length: 400 mm
• lighted: f / 2.0
• central obstruction (diameter / percentage of aperture): 93 mm / 46%
• spectral range: 400 - 800 nm
• Rayleigh / Dawes resolution: 0.68 "/ 0.57"
• Diameter of the optical window: 46 mm
• diameter of full illumination wheel: 22 mm
• full illumination circle field of view: 3.15 °
• useful field of view diameter: 32 mm
• useful field of view: 4.6 °
• spot size: <4.6 µm RMS
• off-axis illumination: 93% @ 11 mm
• finder: missing
• fokuser: Ultra-Stable Focusing System
• back focus (with attached adapter): 25 mm
• back focus (from the end of the thread): 29 mm
• type of optical system coating: StarBright XLT ™
• main mirror cover: aluminum
• mounting for assembly: dovetail CGE
• tube material: aluminum
• cooling: active, built-in
• Diameter of the optical tube: 235 mm
• length of the optical tube: 628 mm
• weight of the optical tube: 7.7 kg

Cameras and cameras compatible with the Celestron Rowe-Ackermann Schmidt 8 "astrograph:

• CMOS / CCD astronomical cameras with C mount: yes (through the included adapter)
• CMOS / CCD astronomical cameras with M42 mount: yes (through the included adapter and adapter ring available separately)
• CMOS / CCD astronomical cameras with other mounts: yes (through appropriate adapters available separately)
• APS-C (Canon) mirrorless cameras: yes (via a dedicated adapter)
• APS-C (Sony) mirrorless cameras: yes (via a dedicated adapter)
• full-frame mirrorless cameras (Canon): yes (no optimal coverage of the entire frame, a dedicated adapter is required)
• full-frame mirrorless cameras (Sony): yes (no optimal coverage of the entire frame, a dedicated adapter required)
• digital SLR cameras - DSLR: no

Elements of the set

• Celestron Rowe-Ackermann Schmidt astrograph (RASA) 8 "
• C-type adapter for mounting a CCD / CMOS camera
• M42 adapter for mounting a CCD / CMOS camera
• battery compartment for the fan

guarantee

24 months