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Vixen A81M AC 81/910 OTA Specs
| Brand | Vixen |
| Full Model Code | Vixen A81M High-End Achromatic Refractor Optical Tube Assembly |
| Country of Origin | Japan (Design, Optical Engineering, and Final Quality Control Inspection) |
| Optical Design | Achromatic Refractor (2-Element Crown and Flint Air-Spaced Fraunhofer Objective Layout) |
| Aperture | 81 mm (3.19 inches) |
| Focal Length | 910 mm |
| Focal Ratio | f/11.23 |
| Optical Coatings | Vixen Multi-Coating (MC) layer coatings across all structural air-to-glass lens borders |
| Glass Material | Premium Grade Japanese Achromatic Crown-Flint Optical Glass Matrix optimized for high edge-to-edge resolution |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.43 Arcseconds (Dawes), 1.71 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.3 |
| Highest Useful Magnification | 162x |
| Lowest Useful Magnification | 12x |
| Optical Tube Material | Precision Rigid Roll-Formed Aluminum Main Tube fitted with complex internal high-contrast baffle rings |
| Focuser Style & Mechanism | 60mm Heavy-Duty Rack and Pinion Focuser featuring dual tension control wheels and an integrated flip-mirror diagonal block |
| Mirror Lock Mechanism | No (Equipped with standard manual structural mechanical lock screws) |
| Optical Tube Dimensions | 90 mm x 890 mm (Tube Outer Diameter x Working Longitudinal Structural Chassis Layout) |
| Optical Tube Weight | 3.50 kg (7.72 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 | 81mm High-End Achromatic Optical Tube, Dual Tube Rings, Vixen Dovetail Plate, Integrated Flip-Mirror Assembly (Dual 1.25-inch Ports) |
| Standard Warranty | 1-Year Limited Warranty (Extended coverage available via verified vendor registration templates) |
| Application | Elite level visual planetary monitoring and double-star splits, utilizing high-precision Japanese optical glass elements and a functional dual-port flip mirror layout. |
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