Celestron 8″ Rowe-Ackermann Schmidt Astrograph (RASA 8)


The Celestron 8″ Rowe-Ackermann Schmidt Astrograph (RASA) optical system is a astrograph telescope, which is designed for astrophotography rather than visual use

This incredibly fast f/2.0 optical tube/telescope is the perfect companion to today’s color astronomical CMOS / USB cameras, smaller CCD cameras, and mirrorless cameras.

Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images. Weighing in at just 7.7 kilograms,  its easy to transport RASA to the most remote dark sky locations.

(Requires mount or tripod) – Optical Tube (OTA) only



  • Aperture: 8.0″ (203.0 mm)
  • Focal Length: 400 mm
  • Focal Ratio: F 2.0
  • Optical Design: Rowe-Ackermann Schmidt Astrograph
  • Eyepieces: (n/a)
    • Astrograph telescopes are desgined for use with cameras
  • Mount Type: Not included, optical tube only
  • GoTo Feature: Not Applicable, mount / tripod required
  • Tripod material: Nil, optical tube Only
  • Focuser: Ultra-Stable Focusing System
  • Warranty: 2 Years


$3,999.00 inc GST

Contact Us For Stock Availability

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The 8″ RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems.

  • Integrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.
  • CGE dovetail mounting rail
  • Flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.
  • NEW Ultra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.




Optical Design Rowe-Ackermann Schmidt Astrograph
Aperture 203mm (8″)
Focal Length 400mm (15.74″)
Focal Ratio f/2.0
Central obstruction diameter 93mm (3.66″) (46% of aperture diameter)
Light Gathering Power (Compared to human eye) 843x
Resolution (Rayleigh) 0.68 arc seconds
Resolution (Dawes) 0.57 arc seconds
Image Circle 22mm (.86″) Ø, 3.15°
Useable field 32mm (1.26″) Ø, 4.6°, only minimal performance loss at edge of FOV
Wavelength range 390 – 800 nm
Spot size < 4.6 μm RMS across image circle
Optical Coatings StarBright XLT
Off-axis Illumination 93% at 11mm (.43″) off-axis
Optical Window 46mm (1.81″) Ø
Back focus with included camera adapter 25mm (.98″)
Back focus from top of threaded collar 29mm (1.14″)
Optical Tube Aluminum
Optical Tube Length 628mm (24.7″) length | 235mm (9.3″) diameter
Focuser Ultra-Stable Focusing System
Finderscope Not included
Optical Tube Weight 17 lbs (7.7 kg)
Other Features Air-cooling system, integrated filter mount
Included items M42 camera adapter, C-thread camera adapter, fan battery pack
Dovetail CGE Dovetail Bar