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Skywatcher AP 100/550 ESPRIT-100ED Professional OTA Specs
| Brand | Sky-Watcher |
| Full Model Code | Sky-Watcher ESPRIT-100ED Professional Triplet Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | China (Manufactured) |
| Optical Design | Apochromatic Refractor (3-Element Air-Spaced Triplet Objective Kit with Dual Ohara ED Element Matrix) |
| Aperture | 100 mm (3.94 inches) |
| Focal Length | 550 mm |
| Focal Ratio | f/5.5 |
| 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 Glass paired with Schott Mating Elements |
| 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 | Heavy-Gauge Aluminum Cylinder Shell with Internal Knife-Edge Glare Baffle Traces |
| Focuser Style & Mechanism | 3.4-inch Linear Power Dual-Speed Rack and Pinion Focuser with 10:1 Micro-Drive and 360 Degree Camera Rotator |
| Mirror Lock Mechanism | Not Applicable |
| Optical Tube Dimensions | 145 mm x 465 mm (With Dew Shield Collapsed) |
| Optical Tube Weight | 7.40 kg (16.31 lbs) |
| Mount Attachment Type | CNC-Machined Ring Cage Array Anchored to a Heavy-Duty Losmandy-Style Dovetail Bar |
| Finder Scope Specification | 9x50 Right-Angle Erect-Image (RAEI) Optical Finder Scope Unit with Quick-Release Base Shoe |
| Included Accessories | 100mm Esprit Triplet OTA, Dedicated 2-Element Thread-On Field Flattener, M48 Camera Adapter, CNC Tube Rings, Losmandy Dovetail Rail, 9x50 RAEI Finder, 2-inch Dielectric Diagonal, Aluminum Hard Case |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Elite wide-field astrophotography imaging runs, using a fast f/5.5 triplet design and high-load 3.4-inch focus driver to project flat, color-pure focal fields across full-frame silicon array chips. |
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