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Vixen SD115S AP 115/890 OTA Specs
| Brand | Vixen |
| Full Model Code | Vixen SD115S Super Extra-Low Dispersion Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Japan (Design, Optical Engineering, Precision Mechanical Fabrication, and Quality Control) |
| Optical Design | Apochromatic Refractor (2-Element Air-Spaced SD Doublet Lens Layout with internal baffling rings) |
| Aperture | 115 mm (4.53 inches) |
| Focal Length | 890 mm |
| Focal Ratio | f/7.74 |
| Optical Coatings | Vixen Broad-Band Multi-Coating sequence engineered to ensure absolute minimum light reflection across the spectrum |
| Glass Material | Premium High-Refractive Super Extra-Low Dispersion (SD) Japanese FPL-53 Glass element for complete color correction |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.01 Arcseconds (Dawes), 1.21 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.1 |
| Highest Useful Magnification | 230x |
| Lowest Useful Magnification | 16x |
| Optical Tube Material | Precision Rigid Roll-Formed Aluminum Main Tube fitted with complex internal high-contrast baffle rings |
| Focuser Style & Mechanism | 60mm Dual-Speed Heavy-Duty Rack and Pinion Focuser featuring high-load structural lock mechanics and dual focus wheels |
| Mirror Lock Mechanism | No (Fixed structural lens elements prevent manual cell shifting or focus mechanics tilt) |
| Optical Tube Dimensions | 125 mm x 930 mm (Tube Outer Diameter x Working Longitudinal Structural Chassis Layout) |
| Optical Tube Weight | 6.20 kg (13.67 lbs) (Total weight rating inclusive of standard CNC tube rings and Vixen-style dovetail bar assembly) |
| Mount Attachment Type | Dual Vixen Tube Rings connected to a standard universal Vixen-Style GP-Level Dovetail Plate Frame |
| Finder Scope Specification | Optional (Pre-drilled structural rear block base ready to accept standard Vixen quick-release shoe modules) |
| Included Accessories | 115mm SD Apochromatic Optical Tube, Dual Tube Rings, Vixen Dovetail Plate, Flip-Mirror Diagonal System |
| Standard Warranty | 1-Year Limited Warranty |
| Application | Premium large-aperture visual observation and serious astrophotography, drawing high-contrast planetary structures with zero false color. |
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