FREE DELIVERY TODAY - 10% Discount for next 3 orders! Place your 1st order in.
Until the end of the sale:
00
days
00
hours
00
minutes
00
sec.
Hot DealsSALE
Soon stocks will run out
Dont miss this opportunity while supplies last.
Vixen SD81S II AP 81/625 OTA Specs
| Brand | Vixen |
| Full Model Code | Vixen SD81S II 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 redesigned internal baffle spacing) |
| Aperture | 81 mm (3.19 inches) |
| Focal Length | 625 mm |
| Focal Ratio | f/7.72 |
| 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 | 1.43 Arcseconds (Dawes), 1.71 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.3 |
| Highest Useful Magnification | 162x |
| Lowest Useful Magnification | 12x |
| Optical Tube Material | Rigid Roll-Formed Aluminum Main Tube fitted with optimized high-contrast internal baffle rings |
| Focuser Style & Mechanism | 60mm Heavy-Duty Rack and Pinion Focuser featuring dual tension control wheels and a dedicated manual lock knob |
| Mirror Lock Mechanism | No (Fixed structural lens elements prevent manual cell shifting or focus mechanics tilt) |
| Optical Tube Dimensions | 90 mm x 585 mm (Tube Outer Diameter x Working Longitudinal Structural Chassis Layout) |
| Optical Tube Weight | 3.60 kg (7.94 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 SD II Apochromatic Optical Tube, Dual Tube Rings, Vixen Dovetail Plate, Flip-Mirror Diagonal System |
| Standard Warranty | 1-Year Limited Warranty |
| Application | High-fidelity mobile field photography and sharp planetary observation, upgrading inner contrast layout configurations to optimize light distribution onto sensors. |
You may also like…
Related products
Reviews
There are no reviews yet.