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Skywatcher N 305/1500 Explorer 300PDS OTA Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher Explorer-300PDS Dual-Speed Parabolic Newtonian Optical Tube Assembly |
| Country of Origin | China (Manufactured) |
| Optical Design | Newtonian Reflector (Parabolic Primary Mirror Layout with Planar Secondary Mirror) |
| Aperture | 305 mm (12.01 inches) |
| Focal Length | 1500 mm |
| Focal Ratio | f/4.92 |
| Optical Coatings | Aluminized Mirror Coating Surface Matrix with Protective Silicon Dioxide Overcoat Shield |
| Glass Material | Premium Optical Borosilicate Glass Substrate optimizing mirror geometry during temperature transitions |
| Secondary Mirror Obstruction | 70 mm |
| Secondary Mirror Obstruction by Diameter | 22.95% |
| Secondary Mirror Obstruction by Area | 5.27% |
| Resolving Power | 0.38 Arcseconds (Dawes), 0.45 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 15.1 |
| Highest Useful Magnification | 610x |
| Lowest Useful Magnification | 43x |
| Optical Tube Material | Roll-Formed Sheet Steel Optical Tube Cylinder Finished in Metallic Black Diamond Powder Coat |
| Focuser Style & Mechanism | 2-inch Dual-Speed Crayford Focuser Assembly featuring 10:1 Micro-Focus Reduction Gear Drive |
| Mirror Lock Mechanism | No (Equipped with standard manual spring-tensioned cell adjustment bolts) |
| Optical Tube Dimensions | 350 mm x 1450 mm |
| Optical Tube Weight | 24.00 kg (52.91 lbs) |
| Mount Attachment Type | Heavy Cast Aluminum Support Tube Rings bolted onto an extended solid Losmandy-style wide dovetail interface plate |
| Finder Scope Specification | 9x50 Optical Straight-Through Finder Scope Kit Complete with O-Ring Alignment Bracket |
| Included Accessories | 305mm PDS Parabolic Newtonian OTA, Tube Rings, Losmandy Dovetail Bar, 9x50 Finder Scope, 2-inch to 1.25-inch Reducer, 28mm 2-inch Eyepiece |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Observatory installation and custom assembly setups, supplying a large-aperture 12-inch reflection unit optimized to project bright star fields into analytical sensors or focus arrays. |
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