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Skywatcher AP 100/900 ED EvoStar DS Pro OTA Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher EvoStar 100ED Doublet Apochromatic Refractor Black Diamond DS-Pro Optical Tube Assembly |
| Country of Origin | China (Manufactured) |
| Optical Design | Apochromatic Refractor (2-Element Air-Spaced ED Doublet Objective Configuration) |
| Aperture | 100 mm (3.94 inches) |
| Focal Length | 900 mm |
| Focal Ratio | f/9 |
| Optical Coatings | Metallic High-Transmission Coating (MHC) Application Generating 99.5% Lens Layer Efficiency |
| Glass Material | Premium Ohara FPL-53 Extra-Low Dispersion Synthetic Fluorite Core Component with Schott Glass Companion Lens |
| 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 | 1.16 Arcseconds (Dawes), 1.38 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.5 |
| Highest Useful Magnification | 200x |
| Lowest Useful Magnification | 14x |
| 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 | Not Applicable |
| Optical Tube Dimensions | 115 mm x 920 mm |
| Optical Tube Weight | 3.80 kg (8.38 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 | 100mm ED Doublet OTA, Support Tube Rings, Vixen-Style Dovetail Bar, 9x50 Finder Scope, 2-inch Dielectric Star Diagonal, 28mm 2-inch Eyepiece, Aluminum Flight Case |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-contrast planetary target tracking and double-star splitting loops, relying on a long f/9 system structure to execute high-power magnification without introducing residual aberration components. |
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