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Skywatcher AC 90/900 EvoStar EQ-2 Telescope Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher EvoStar 90 Achromatic Refractor Kit with EQ2 Manual Equatorial Mount |
| Country of Origin | China (Manufactured) |
| Optical Design | Achromatic Refractor (Crown-and-Flint Doublet Air-Spaced Optic Configuration Layout) |
| Aperture | 90 mm (3.54 inches) |
| Focal Length | 900 mm |
| Focal Ratio | f/10 |
| 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 | 1.29 Arcseconds (Dawes), 1.53 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.3 |
| Highest Useful Magnification | 180x |
| Lowest Useful Magnification | 13x |
| Optical Tube Material | Roll-Formed Sheet Steel Optical Tube Cylinder Finished in Metallic Black Diamond Powder Coat |
| Focuser Style & Mechanism | 1.25-inch Rack and Pinion Focuser Assembly with Direct Tension-Adjust Locking Screws |
| Mirror Lock Mechanism | Not Applicable |
| Optical Tube Dimensions | 96 mm x 865 mm |
| Optical Tube Weight | 2.50 kg (5.51 lbs) (OTA Only) / 10.50 kg (23.15 lbs) (Complete Mount Setup Weight) |
| Mount Attachment Type | Cast Aluminum Tube Rings bolted to a Light Vixen-Style Dovetail Bar Interfacing |
| Finder Scope Specification | 6x30 Optical Straight-Through Finder Scope Kit Complete with O-Ring Alignment Bracket |
| Included Accessories | 90mm Achromatic Refractor, EQ2 Equatorial Mounthead, Adjustable Aluminum Tripod, Slow-Motion Manual Control Rods, Counterweight, 6x30 Finder, 90-Degree Star Diagonal, Super 25mm Eyepiece, Super 10mm Eyepiece |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Entry-level astronomical tracking training sequences, using an equatorial polar gear layout to continuously trace planetary arcs across long evening sessions. |
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