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11″ Rowe-Ackerman Schmidt-Cassegrain Astrograph (RASA 11) V2

425,999.00 excl. 18% GST

  • Fast, wide-field 11” f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature
  • Large 43.3mm optimized image circle maintains pinpoint stars to the far corners of even the largest astroimaging sensors, while the usable field extends even further to 52mm for larger format sensors
  • New Ultra-Stable Focus System (USFS) minimizes focus shift and mirror flop
  • Integrated air-cooling system features a quiet, high-output 12V MagLev fan and vents with mesh filters to prevent dust ingress
  • Common camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras

Available on backorder

Optical Design Rowe-Ackermann Schmidt Astrograph
Aperture 279mm (11″)
Focal Length 620mm (24.4″)
Focal Ratio f/2.2
Central obstruction diameter 114mm (4.48″) (41% of aperture diameter)
Light Gathering Power (Compared to human eye) 1588x
Resolution (Rayleigh) 0.49 arc seconds
Resolution (Dawes) 0.41 arc seconds
Image Circle 43.3mm (1.7″) Ø , 4.0°
Useable field 52mm (2.04″) Ø , 4.8° only minimal performance loss at edge of FOV
Wavelength range 400 – 700 nm
Spot size < 4.4 μm RMS across FOV
Optical Coatings StarBright XLT
Off-axis Illumination 83% at 21mm (.82″) off-axis
Optical Window 68mm (2.67″) Ø
Back focus with included camera adapter 55mm (2.16″)
Back focus from top of threaded collar 72.8mm (2.86″)
Optical Tube Aluminum
Optical Tube Length 838.2mm (33″)
Optical Tube Diameter 330.2mm (13″)
Focuser Ultra-Stable Focus System
Finderscope Not included
Optical Tube Weight 43 lbs (19.5 kg)
Other Features Ventilation fan, dual dovetail mounting bars
Included items 42mm (1.65″) T-thread camera adapter | 48mm (1.89″) camera adapter | Dust cover | Fan battery pack
Dovetail CGE Dovetail Bar



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