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Tecnosky AP 70/350 Quadruplet V2 OTA Specs
| Brand | Tecnosky |
| Full Model Code | Tecnosky AP 70/350 Quadruplet Version 2 Extra-Low Dispersion Apochromatic Astrograph Optical Tube Assembly |
| Country of Origin | Italy (Design) / Japan (Ohara Sourced Lens Glass Integration Layout) |
| Optical Design | Apochromatic Astrograph (4-Element Petzval Quadruplet Optical layout using an FPL-53 and Lanthanum glass configuration) |
| Aperture | 70 mm (2.75 inches) |
| Focal Length | 350 mm |
| Focal Ratio | f/5.00 |
| Optical Coatings | Premium Broad-Band Fully Multi-Coated Layers applied to all air-glass boundary paths |
| Glass Material | Japanese Ohara FPL-53 Glass core aligned with Lanthanum components to achieve a flat optical field without an external correction block |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.66 Arcseconds (Dawes), 1.99 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.0 |
| Highest Useful Magnification | 140x |
| Lowest Useful Magnification | 10x |
| Optical Tube Material | Rigid Powder-Coated Aluminum Flat-Field Tube with optimized internal anti-reflection baffles |
| Focuser Style & Mechanism | 2.5-inch Magnesium Alloy Rack and Pinion Focuser Unit with 1:10 micro-reduction assembly, offset field rotator module, M48x0.75 camera connection threads, and a dedicated 66mm backfocus track limit |
| Mirror Lock Mechanism | No (Equipped with standard manual drawtube tension locks) |
| Optical Tube Dimensions | 85 mm x 325 mm (Tube Outer Diameter x Approximate Transport State Length) |
| Optical Tube Weight | 3.94 kg (8.69 lbs) (Complete Operating Frame weight including Clamps and Vixen Dovetail rail) |
| Mount Attachment Type | CNC-Machined Tube Clamps attached directly to a Universal Vixen-Style Dovetail Mounting Plate Frame |
| Finder Scope Specification | Universal Finder Shoe module block integrated onto the structural tube ring framework |
| Included Accessories | 70mm Quadruplet Optical Cell, Retractable Dew Shield, 2.5-inch Precision Focuser with Camera Adaptor Threads, CNC Rings, Vixen Dovetail Rail |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Professional wide-field flat-field astrophotography campaigns, providing sharp pinpoint stars across the entire surface of full-frame imaging sensors without requiring external correcting elements. |
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