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William Optics ZenithStar ZS61 II AP 61/360 OTA Specs
| Brand | William Optics |
| Full Model Code | William Optics ZenithStar 61 Mark II Extra-Low Dispersion Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Taiwan (Design, Precision Engineering, Structural Fabrication, and Optical Assembly) |
| Optical Design | Apochromatic Refractor (2-Element Air-Spaced Doublet Lens Layout with internal baffling rings) |
| Aperture | 61 mm (2.40 inches) |
| Focal Length | 360 mm |
| Focal Ratio | f/5.90 |
| Optical Coatings | Ultra-Pure Multi-Layer Anti-Reflective coatings (STM Coating) applied across all structural air-to-glass lens borders |
| Glass Material | Premium FPL-53 Synthetic Fluorite Extra-Low Dispersion (ED) Japanese Glass substrate for advanced chromatic balance |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.90 Arcseconds (Dawes), 2.26 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 10.7 |
| Highest Useful Magnification | 122x |
| Lowest Useful Magnification | 9x |
| Optical Tube Material | CNC-Machined High-Grade Aluminum Alloy Tube Body finished in powder-white with premium hard-anodized accent panels |
| Focuser Style & Mechanism | 2.0-inch Heavy-Duty Rack and Pinion Focuser featuring an integrated visual scale index and 10:1 dual-speed micro-drive knobs |
| Mirror Lock Mechanism | No (Fixed structural lens elements prevent manual cell shifting or focus mechanics tilt) |
| Optical Tube Dimensions | 73 mm x 230 mm (Tube Outer Diameter x Minimum Collapsed Structural Length with retracted dew shield) |
| Optical Tube Weight | 2.18 kg (4.81 lbs) (Total weight rating inclusive of standard dual CNC tube rings and Vixen-style dovetail bar assembly) |
| Mount Attachment Type | Dual CNC Mounting Rings linked to a standard combined Vixen-style and Arca-Swiss compatible Dovetail Mounting Plate |
| Finder Scope Specification | Integrated Patented Bahtinov Focus Mask configured inside the structural aluminum slide-out dew shield cap assembly |
| Included Accessories | 61mm ZS II Doublet Optical Tube, Dual CNC Tube Rings, Saddle Handle Bar, Arca-Swiss/Vixen Dovetail Rail, Integrated Bahtinov Mask Cap |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Ultimate lightweight mobile deep-sky photography and wildlife observation, providing star pinpoint crispness inside a travel-friendly ultra-compact footprint layout. |
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