Celestron Rowe-Ackermann 6" OTA (Celestron, SKU: 91071) is a compact Rowe-Ackermann Schmidt Astrograph (RASA 6) with an f/2.2 optical system and 335 mm focal length, built for wide-field astrophotography. The focal plane is located at the front of the telescope, so it is not intended for visual observing with eyepieces. The design provides a flat image field and is optimized for modern CMOS cameras and smaller CCD cameras.

Key features

• Rowe-Ackermann Schmidt astrograph (RASA) designed for wide-field imaging
• ultra-fast f/2.2 focal ratio for short exposures
• 335 mm focal length and 152 mm (6") aperture
• front-mounted focal plane — not suitable for visual observing with standard eyepieces
• flat image field as part of the RASA optical design
• optimized for CMOS cameras and smaller CCD cameras
• integrated 2" filter drawer (filter drawer)
• built-in ventilation system to help equalize optics temperature with ambient conditions
• StarBright XLT coatings
• Vixen-style dovetail rail

Box contents

• Celestron Rowe-Ackermann 6" OTA (RASA 6)
• Vixen-style dovetail rail

Technical specifications

• item number: 91071
• optical design: Rowe-Ackermann Schmidt Astrograph (RASA)
• mount: none (OTA)
• aperture: 152 mm
• focal length: 335 mm
• focal ratio: f/2.2
• resolving power (Rayleigh): 0.91"
• resolving power (Dawes): 0.76"
• light gathering power: 472×
• optical tube weight: 3.8 kg
• tube length: 500 mm
• tube diameter: 178 mm
• secondary mirror diameter: 77 mm
• central obstruction: 46%
• fine focus controls: no
• coatings: StarBright XLT
• dovetail rail: Vixen
• warranty: 36 months

RASA 6 is a specialized OTA for fast, wide-field astrophotography, combining a short 335 mm focal length with an f/2.2 system to capture large areas of the sky efficiently with a camera.