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Hubble Dobson N 508/1880 UL20 f/3.7 UL DOB Specs
| Brand | Hubble Optics |
| Full Model Code | Hubble Optics Ultra Light 20-inch Premium Dobsonian f/3.7 Configuration (UL20-F3.7) |
| Country of Origin | United States / China |
| Optical Design | Newtonian Dobsonian (Parabolic Lightweight Sandwich Primary Mirror) |
| Aperture | 508 mm (20.0 inches) |
| Focal Length | 1880 mm |
| Focal Ratio | f/3.7 |
| Optical Coatings | 92% Enhanced Aluminum Coating Matrix with Silicon Dioxide Protective Layers |
| Glass Material | Premium Low-Expansion Precision Structural Sandwich Glass (Hubble Proprietary) |
| Secondary Mirror Obstruction | 110 mm |
| Secondary Mirror Obstruction by Diameter | 21.6% |
| Secondary Mirror Obstruction by Area | 4.7% |
| Resolving Power | 0.23 Arcseconds (Dawes), 0.27 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 15.3 |
| Highest Useful Magnification | 1016x |
| Lowest Useful Magnification | 72x |
| Optical Tube Material | Premium CNC-Machined T6061 Aluminum Alloy Truss Structure (Black Anodized Finish) |
| Focuser Style & Mechanism | 2.0-inch Low-Profile Dual-Speed Crayford Focuser with 10:1 Micro-Focus Adjustment |
| Mirror Lock Mechanism | No (Equipped with Integrated 12V Dual Boundary Layer Mirror Fans Configuration) |
| Optical Tube Dimensions | Truss Construction (Mirror Box Footprint: 610 mm x 610 mm x 330 mm) |
| Optical Tube Weight | 41.50 kg (91.49 lbs) - Total Combined System Operational Weight |
| Mount Attachment Type | Heavy-Duty Curved Aluminum Altitude Arcs on Minimalist Open Ground Rocker Framework |
| Finder Scope Specification | Optional Red Dot or Optical Finder Bracket Slot |
| Included Accessories | 20-inch f/3.7 Sandwich Primary Mirror, Open Frame Aluminum Mirror Box, Truss Tubes Pack, Upper Ring Cage with Spider, Dual Rear Evacuation Cooling Fans, 10:1 Focuser |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Observatory-scale wide-field deep-sky survey mapping, deploying an ultra-fast f/3.7 parabolic layout to yield bright visual exit pupils while maintaining a completely ladder-free zenith viewing height. |
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