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Levenhuk Cassegrain C 153/1836 Ra 150C OTA Specs
| Brand | Levenhuk |
| Full Model Code | Levenhuk Ra 150C Cassegrain Optical Tube Assembly (74112) |
| Country of Origin | United States / China |
| Optical Design | Classical Cassegrain (Parabolic Primary and Hyperbolic Secondary Mirrors) |
| Aperture | 153 mm (6.0 inches) |
| Focal Length | 1836 mm |
| Focal Ratio | f/12 |
| Optical Coatings | High-Reflectivity Aluminum Coating Matrix with Quartz Protection Layer (96% Reflectivity) |
| Glass Material | Premium Low-Expansion Thermal Quartz Glass Substrates |
| Secondary Mirror Obstruction | 50 mm |
| Secondary Mirror Obstruction by Diameter | 32.7% |
| Secondary Mirror Obstruction by Area | 10.7% |
| Resolving Power | 0.76 Arcseconds (Dawes), 0.91 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 13.4 |
| Highest Useful Magnification | 300x |
| Lowest Useful Magnification | 22x |
| Optical Tube Material | Powder-Coated Steel Cylinder Structure with Machined Aluminum Fittings |
| Focuser Style & Mechanism | 2.0-inch Dual-Speed Crayford Focuser with 10:1 Micro-Gear Reduction System and Brass Compression Rings |
| Mirror Lock Mechanism | No (Fixed Mirror Cell Architecture Completely Eliminates Primary Mirror Shift) |
| Optical Tube Dimensions | 185 mm x 580 mm |
| Optical Tube Weight | 5.40 kg (11.9 lbs) |
| Mount Attachment Type | Universal Vixen Style Dovetail Bar Profile |
| Finder Scope Specification | Optional Accessory Slot Configuration |
| Included Accessories | 150mm Cassegrain Optical Tube Assembly, 2.0-inch Dual-Speed Crayford Focuser, 1.25-inch Reducer Adapter, 2x Focal Extension Rings (1x 25mm, 1x 50mm), Vixen-Style Dovetail Bar |
| Standard Warranty | Lifetime Warranty |
| Application | High-contrast planetary edge tracking and deep-sky imaging, pairing an open-tube design with thermal quartz cores to stabilize tracking matrices without internal dew retention traps. |
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