Celestron C11-A XLT Optical Tube Assembly
Celestron provides their Schmidt Cassegrain optics as a tube assembly only to use with your favourite mount.
- 11" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron's premium StarBright XLT coatings
- 2800 mm focal length (f/10)
- 40 mm eyepiece included (70x)
- Visual back allows for use with 1.25" accessories
- 9x50 finderscope to help accurately find objects
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
- Includes dovetail rail compatible with CGE (wide 3") dovetails
Celestron C11-A XLT OTA Specifications
| Optical Design | Schmidt-Cassegrain |
|---|---|
| Aperture (mm) | 279.4 mm (11 in) |
| Focal Length | 2800 mm (110 in) |
| Focal Ratio | 10 |
| Focal Length of Eyepiece | 40 mm |
| Magnification of Eyepiece | 70 x |
| Finderscope | 9x50 |
| Star Diagonal | 1.25" |
| Optical Tube | Aluminum |
| Highest Useful Magnification | 660 x |
| Lowest Useful Magnification | 40 x |
| Limiting Stellar Magnitude | 14.7 |
| Resolution (Rayleigh) | 0.5 arc seconds |
| Resolution (Dawes) | 0.42 arc seconds |
| Light Gathering Power (Compared to human eye) | 1593 x |
| Secondary Mirror Obstruction | 95 mm |
| Secondary Mirror Obstruction by Diameter | 34% |
| Secondary Mirror Obstruction by Area | 12% |
| Optical Coatings | StarBright / XLT |
| Optical Tube Length | 610 mm |
| Optical Tube Weight | 12 kg |
| Dovetail Compatibility | CGE Mount |