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Skywatcher Dobson N 254/1200 Pyrex Skyliner Classic DOB Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher Skyliner-250P Classic Traditional Dobsonian Telescope with Pyrex Primary Mirror |
| Country of Origin | China (Manufactured) |
| Optical Design | Newtonian Reflector (Parabolic Primary Mirror Layout with Planar Secondary Mirror) |
| Aperture | 254 mm (10.00 inches) |
| Focal Length | 1200 mm |
| Focal Ratio | f/4.72 |
| Optical Coatings | Aluminized Mirror Coating Surface Matrix with Protective Silicon Dioxide Overcoat Shield |
| Glass Material | Low-Expansion Pyrex Glass Substrate delivering minimal thermal expansion distortion coefficients |
| Secondary Mirror Obstruction | 58 mm |
| Secondary Mirror Obstruction by Diameter | 22.83% |
| Secondary Mirror Obstruction by Area | 5.21% |
| Resolving Power | 0.46 Arcseconds (Dawes), 0.54 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 14.1 |
| Highest Useful Magnification | 508x |
| Lowest Useful Magnification | 36x |
| Optical Tube Material | Roll-Formed Heavy-Gauge Steel Optical Tube Cylinder Finished in Gloss White Powder Coat |
| Focuser Style & Mechanism | 2-inch Crayford Focuser with built-in adjustable tension knobs and 1.25-inch adaptor sleeve |
| Mirror Lock Mechanism | No (Equipped with standard manual spring-tensioned cell adjustment bolts) |
| Optical Tube Dimensions | 288 mm x 1120 mm |
| Optical Tube Weight | 14.30 kg (31.53 lbs) (OTA Only) / 26.80 kg (59.08 lbs) (Complete Mount Setup Weight) |
| Mount Attachment Type | Side-Mounted Navigation Tension Clamps slipping directly into wooden rocker box side channels |
| Finder Scope Specification | 9x50 Optical Straight-Through Finder Scope Kit Complete with O-Ring Alignment Bracket |
| Included Accessories | 254mm Pyrex Newtonian OTA, Floor-Standing Wooden Rocker Box Base, 9x50 Finder, 25mm Eyepiece, 10mm Eyepiece |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Manual deep-space nebula hunting and detailed high-power planetary inspection, utilizing a low-expansion Pyrex substrate block to achieve short optical cooldown timelines. |
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