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Vixen Fluorit FL55SS AP 55/303 OTA Specs
| Brand | Vixen |
| Full Model Code | Vixen FL55SS Fluorite Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Japan (Design, Optical Engineering, Precision Mechanical Polishing, and Final Qualification) |
| Optical Design | Apochromatic Refractor (2-Element Air-Spaced Fluorite Doublet Configuration) |
| Aperture | 55 mm (2.17 inches) |
| Focal Length | 303 mm |
| Focal Ratio | f/5.51 |
| Optical Coatings | Vixen Ultra-High Transmission Multi-Coating sequence optimized for peak digital sensor efficiency |
| Glass Material | Genuine CaF2 Fluorite Crystal internal objective substrate providing absolute color aberration removal |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 2.11 Arcseconds (Dawes), 2.53 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 10.5 |
| Highest Useful Magnification | 110x |
| Lowest Useful Magnification | 8x |
| Optical Tube Material | Precision Machined High-Grade Aluminum Alloy main body chassis featuring a slide-out built-in dew shield |
| Focuser Style & Mechanism | 60mm Specialized Rack and Pinion Focuser featuring high-load structural lock mechanics and dual coarse control wheels |
| Mirror Lock Mechanism | No (Equipped with standard manual structural mechanical lock screws) |
| Optical Tube Dimensions | 80 mm x 282 mm (Tube Outer Diameter x Minimum Collapsed Stowed Length Profile Framework) |
| Optical Tube Weight | 1.50 kg (3.31 lbs) (Net structural weight excluding downstream slide plate rails or finder guide accessories) |
| Mount Attachment Type | Integrated Machined Vixen-Style GP-Level Dovetail Mounting Plate Rail running under the primary chassis body |
| Finder Scope Specification | Optional (Pre-drilled structural rear block base ready to accept standard Vixen quick-release shoe modules) |
| Included Accessories | 55mm Genuine Fluorite Optical Tube, Built-in Vixen Dovetail Rail Frame, 1.25-inch Visual Adapter Extension Ring |
| Standard Warranty | 1-Year Limited Warranty (Extended coverage available via verified vendor registration templates) |
| Application | Ultra-portable high-end astrophotography and eclipse chaser observation, delivering pin-sharp star spots onto full-frame tracking chips via a real CaF2 core setup. |
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