C11-A-XLT (CGE) Optical Tube Assembly
Celestron
From $3,299.95
2 stores
The Celestron C11-A-XLT is an 11-inch Schmidt-Cassegrain optical tube assembly featuring Celestron's premium StarBright XLT optical coatings that achieve 97.4% light transmission for exceptionally bright deep-space imaging and high-contrast lunar and planetary observation. This portable optical tube combines serious light-gathering capability with practicality, measuring just 24 inches in length and weighing 27.5 pounds, making it suitable for both stationary observatories and field use by individual observers. The f/10 focal ratio offers excellent versatility for astrophotography, visual observing, and compatibility with popular imaging accessories including Fastar and optional f/6.3 focal reducers, while the CGE-style dovetail bar enables use with many computerized telescope mounts.
Specifications
| Focal ratio | f/10 |
| Optical Coatings | StarBright XLT |
| Resolution (Dawes) | 0.42″ |
| Fastar Compatible | ✓ |
| Included Eyepiece | 40 mm |
| Tube Length | 24 mm |
| Light Transmission | 97.4% |
| Limiting Stellar Magnitude | 14.7 |
| Maximum Payload Recommendation | 33 lb |
| Aperture | 279.4 mm |
| Weight (Metric) | 12.5 g |
| Minimum Magnification | 40 |
| Mount type | CGE (Losmandy) Dovetail |
| Finderscope | 9x50 |
| Focal length | 2800 mm |
| Tube Material | Aluminum |
| Resolution (Rayleigh) | 0.5″ |
| Star Diagonal | 1.25 inch |
| Visual Back | 1.25 inch |
| Optical design | Schmidt-Cassegrain |
| Weight | 27.5 lb |
| Maximum Magnification | 660 |
| Light Gathering Power | 1593 |
| Included Eyepiece Magnification | 70 |