Description
- 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
Specifications
| 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 (0.82″) 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 |
| Additional Information | |
| Solar Warning |
|
| California Prop 65 |
WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov
|
