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Skywatcher AC 120/1000 EvoStar OTA Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher EvoStar 120 Achromatic Refractor Optical Tube Assembly |
| Country of Origin | China (Manufactured) |
| Optical Design | Achromatic Refractor (Crown-and-Flint Doublet Air-Spaced Optic Configuration Layout) |
| Aperture | 120 mm (4.72 inches) |
| Focal Length | 1000 mm |
| Focal Ratio | f/8.3 |
| Optical Coatings | Multi-Coated Optical Lens Surface Coating Anti-Reflective System |
| Glass Material | Standard Optical Crown and Flint Glass Substrate Components |
| Secondary Mirror Obstruction | 0 mm (Refractor Design with Clear Optical Path Layout) |
| Secondary Mirror Obstruction by Diameter | 0.00% |
| Secondary Mirror Obstruction by Area | 0.00% |
| Resolving Power | 0.96 Arcseconds (Dawes), 1.15 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.9 |
| Highest Useful Magnification | 240x |
| Lowest Useful Magnification | 17x |
| Optical Tube Material | Roll-Formed Sheet Steel Optical Tube Cylinder Finished in Metallic Black Diamond Powder Coat |
| Focuser Style & Mechanism | 2-inch Rack and Pinion Focuser Assembly with Direct Tension-Adjust Locking Screws |
| Mirror Lock Mechanism | Not Applicable |
| Optical Tube Dimensions | 130 mm x 980 mm |
| Optical Tube Weight | 5.10 kg (11.24 lbs) |
| Mount Attachment Type | Cast Aluminum Tube Rings bolted to a Standard Medium Vixen-Style Dovetail Bar Interfacing |
| Finder Scope Specification | 9x50 Optical Straight-Through Finder Scope Kit Complete with O-Ring Alignment Bracket |
| Included Accessories | 120mm Achromatic Refractor OTA, Cast Tube Rings, Vixen Dovetail Plate, 9x50 Finder Scope, 2-inch Star Diagonal, 1.25-inch Adapter Piece |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Custom mount tracking configurations looking for a large-aperture traditional refractor barrel to conduct planetary resolution tests and split bright double star targets. |






















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