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Omegon Pro APO AP 66/400 ED OTA Specs
| Brand | Omegon Pro |
| Full Model Code | Omegon Pro APO AP 66/400 ED Doublet Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Germany (Designed) / Taiwan (Manufactured) |
| Optical Design | Apochromatic Refractor (Two-Element Doublet Air-Spaced ED Lens Layout) |
| Aperture | 66 mm (2.60 inches) |
| Focal Length | 400 mm |
| Focal Ratio | f/6.1 |
| Optical Coatings | SMC Ultra-Wideband Multi-Layer Anti-Reflective Dispersion Matrix Film System |
| Glass Material | Premium Ohara FPL51 Extra-Low Dispersion Optical Glass Core Element |
| Secondary Mirror Obstruction | 0 mm (Refractor System / Free Aperture Profile) |
| Secondary Mirror Obstruction by Diameter | 0.0% |
| Secondary Mirror Obstruction by Area | 0.00% |
| Resolving Power | 1.76 Arcseconds (Dawes), 2.09 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 10.9 |
| Highest Useful Magnification | 132x |
| Lowest Useful Magnification | 9x |
| Optical Tube Material | Machined Aerospace-Grade Aluminum Body Shell with Retractable Dew Shield Housing |
| Focuser Style & Mechanism | 1.75-inch Dual-Speed Crayford Friction Drive Focuser with 1:10 Precision Micro-Focus Reduction |
| Mirror Lock Mechanism | No (Refractor Mechanical Focuser Layout Inapplicable) |
| Optical Tube Dimensions | 80 mm x 300 mm |
| Optical Tube Weight | 1.40 kg (3.09 lbs) |
| Mount Attachment Type | Integrated L-Shape Mounting Foot Bracket with 1/4-inch Internal Photo Thread Port Channels |
| Finder Scope Specification | Not Included / Mini Slot Frame Inapplicable to Ultra-Compact Refractor Chassis |
| Included Accessories | 66mm ED Apo OTA, Retractable Dew Shield, Integrated 1.75-inch Crayford Focuser, SC-Thread Rear Adapter, 1.25-inch Push-Fit Adapter Collar, Soft Protective Carry Bag |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Ultra-portable grab-and-go terrestrial tracking loops and rich-field celestial scanning, utilizing a compact fast doublet lens frame to fit within hand luggage restrictions. |
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