Celestron C9 1/4-A XLT (CGE)Optical Tube Assembly
| Article number: | 91027-XLT |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to Us |
General Features
- 9.25" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron's premium StarBright XLT coatings
- 2350 mm focal length (f/10)
- 25 mm eyepiece included (94x)
- Visual back allows for use with 1.25" accessories
- 6x30 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 mount
Specifications
| Optical Design | Schmidt-Cassegrain |
|---|---|
| Aperture (mm) | 234.95 mm (9.25 in) |
| Focal Length | 2350 mm (93 in) |
| Focal Ratio | 10 |
| Focal Length of Eyepiece 1 (mm) | 25 mm (0.98 in) |
| Magnification of Eyepiece 1 | 94 x |
| Finderscope | 6x30 |
| Star Diagonal | 1.25 |
| Optical Tube | Aluminum |
| Highest Useful Magnification | 555 x |
| Lowest Useful Magnification | 34 x |
| Limiting Stellar Magnitude | 14.4 |
| Resolution (Rayleigh) | 0.59 arc seconds |
| Resolution (Dawes) | 0.49 arc seconds |
| Light Gathering Power (Compared to human eye) | 1127 x |
| Secondary Mirror Obstruction | 3.35 in (85 mm) |
| Secondary Mirror Obstruction by Diameter | 36% |
| Secondary Mirror Obstruction by Area | 13% |
| Optical Coatings | StarBright / XLT |
| Optical Tube Length | 22 in (559 mm) |
| Optical Tube Weight | 20 lbs (9.07 kg) |
| Dovetail Compatibility | CGE Mount |
