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 TUBE INFO:
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