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Levenhuk AP 66/400 ED Ra Carbon OTA Specs
| Brand | Levenhuk |
| Full Model Code | Levenhuk Ra 66 ED Doublet Carbon Fiber Optical Tube Assembly (65839) |
| Country of Origin | United States / China |
| Optical Design | Apochromatic Refractor (ED Doublet Core) |
| Aperture | 66 mm (2.6 inches) |
| Focal Length | 400 mm |
| Focal Ratio | f/6.06 |
| Optical Coatings | Fully Multi-Coated Ultra-Wideband Anti-Reflective Matrix |
| Glass Material | Extra-Low Dispersion (ED) Optical Glass Element (FPL-53 Equivalent) |
| Secondary Mirror Obstruction | 0 mm (None) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.75 Arcseconds (Dawes), 2.09 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.6 |
| Highest Useful Magnification | 132x |
| Lowest Useful Magnification | 10x |
| Optical Tube Material | Premium High-Modulus Carbon Fiber weave structure with CNC Machined Aluminum Accents |
| Focuser Style & Mechanism | 2.0-inch Dual-Speed Crayford Focuser with 10:1 Micro-Gear Reduction System and 360-Degree Rotation |
| Mirror Lock Mechanism | No (Integrated Focuser Lock Screw Included) |
| Optical Tube Dimensions | 75 mm x 300 mm (with Retracted Dew Shield) |
| Optical Tube Weight | 1.40 kg (3.09 lbs) |
| Mount Attachment Type | Integrated Low-Profile L-Shape Mounting Bracket with 1/4-inch Photo Thread and Vixen-Style Profile |
| Finder Scope Specification | Optional Accessory Slot Configuration |
| Included Accessories | Carbon Fiber Optical Tube, 2.0-inch Crayford Focuser, 1.25-inch Step-Down Reducer Adapter, Retractable Dew Shield, Heavy-Duty Aluminum Flight Case |
| Standard Warranty | Lifetime Warranty |
| Application | Achromatic color correction tracking and wide-field astrophotography, packing an absolute coma-free catadioptric baseline configuration to eliminate visual distortions during deep-sky survey sweeps. |




































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