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36 cm Rowe-Ackermann Schmidt Astrograph



The Rowe-Ackermann Schmidt Astrograph (RASA), is a cost-effective optical system for space surveillance, Space Situational Awareness (SSA), other scientific applications, and advanced wide field astroimaging. It offers unprecedented value in aperture, speed, field of view, and optical performance. The RASA design has a convenient external prime-focus image capture location with a flat focal plane, providing small spot sizes to the edge of a wide field. The result is images free of optical defects like field curvature, off-axis coma, and astigmatism.

The 36 cm aperture version is the largest RASA Celestron manufactures; it is the biggest and fastest (f/2.2) optical instrument of its kind available “off-the-shelf.” Unlike most telescopes, which only focus visible light (400-700 nm), the RASA 36 cm focuses an extended spectral range (400-900 nm), allowing a brighter signal to be detected by a camera sensor. The RASA 36 cm also features a redesigned focus system, which ensures easy and stable focusing.

RASA 36 cm’s ample back-focus distance (77.5 mm) accommodates a wide variety of imaging sensors. A custom camera adapter can be added for a field of view up to 4.4 degrees.

OPTICAL TUBE INFO: Optical Design Rowe-Ackermann Schmidt Astrograph Aperture (mm) 355.6 mm Focal Length: 790 mm Focal Ratio f/2.2 Central obstruction diameter 158 mm (44% of aperture diameter) Light Gathering Power (Compared to human eye) 2581X Resolution (Rayleigh) 0.39 arc seconds Resolution (Dawes) 0.36 arc seconds Image circle: 60.1 mm Ø, 4.4° Useable field: 70 mm Ø, 5.1°, only minimal performance loss at edge of FOV Wavelength range 400 – 900 nm Spot size < 6.3 μm RMS across FOV Optical coatings Enhanced aluminum, XLT multi-coatings used throughout Off-axis Illumination: 83% at 30 mm off-axis Optical window: 104 mm Ø Back focus with included camera adapter: 55 mm Back focus from top of threaded collar: 77.5 mm Optical Tube: Aluminum Optical Tube Length 42.5" length, 16" diameter Focuser: New focuser design, minimizes focus shift Finderscope: Not included Optical Tube Weight: 75 lbs Other features Ventilation fan, dual dovetail mounting bars Included items 48 mm camera adapter, fan battery pack

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