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Celestron SC 356/3910 C14 Cassegrain OTA Specs
| Brand | Celestron |
| Full Model Code | Celestron C14-A XLT Optical Tube Assembly (91039-XLT / 91040-XLT) |
| Country of Origin | United States / China |
| Optical Design | Schmidt-Cassegrain (Catadioptric Core) |
| Aperture | 355.6 mm (14.0 inches) |
| Focal Length | 3910 mm |
| Focal Ratio | f/11 |
| Optical Coatings | Premium StarBright XLT High-Transmission Coatings |
| Secondary Mirror Obstruction | 114 mm |
| Secondary Mirror Obstruction by Diameter | 32% |
| Secondary Mirror Obstruction by Area | 10% |
| Resolving Power | 0.33 Arcseconds (Dawes), 0.39 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 15.3 |
| Highest Useful Magnification | 840x |
| Lowest Useful Magnification | 51x |
| Optical Tube Material | Aluminum |
| Focuser Style & Mechanism | Internal Primary Mirror Focus Assembly with Pre-Loaded Ball Bearings to Prevent Image Shift |
| Mirror Lock Mechanism | No (Fastar and HyperStar Compatible) |
| Optical Tube Dimensions | 400.5 mm x 787 mm |
| Optical Tube Weight | 20.41 kg (45.0 lbs) |
| Mount Attachment Type | Available with CGE Losmandy-Style or Heavy-Duty Dovetail Bar Profiles |
| Finder Scope Specification | 9x50 Optical Finder Scope with Bracket |
| Included Accessories | 40mm Plossl Eyepiece (98x), 2-inch Mirror Diagonal, 2-inch Visual Back, 1.25-inch Adapter, Carrying Handle, Dovetail Mounting Rail |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-aperture observatory-grade standalone core optimized for high-resolution deep sky tracking and fine planetary mapping, using a rigid f/11 aluminum housing to gather light across remote celestial targets. |
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