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TS Optics AP 70/474 OTA Specs
| Brand | TS Optics (Teleskop-Service) |
| Full Model Code | TS Optics Imaging Star 70 mm f/6.77 Quadruplet Flatfield Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Germany (Design / Quality Control) |
| Optical Design | Apochromatic Astrograph (4-Element Petzval-Style Quadruplet layout utilizing an integrated dual-lens field corrector system) |
| Aperture | 70 mm (2.76 inches) |
| Focal Length | 474 mm |
| Focal Ratio | f/6.77 |
| Optical Coatings | Advanced Broad-Band Multi-Coated Matrix layers on all air-to-glass optical boundaries |
| Glass Material | Premium Lanthanum Extra-Low Dispersion Glass core element matched with optimized secondary high-refractive glass layers |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.64 Arcseconds (Dawes), 1.97 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.0 |
| Highest Useful Magnification | 140x |
| Lowest Useful Magnification | 10x |
| Optical Tube Material | Precision Machined Aluminum Main Tube built with computed interior contrast baffles and anti-reflection flocking |
| Focuser Style & Mechanism | 2.5-inch Heavy-Duty Gear-Driven Rack and Pinion Focuser featuring 1:10 dual-speed reduction and M54 camera adaptation threads |
| Mirror Lock Mechanism | No (Equipped with an integrated split-ring structural tension locking screw setup) |
| Optical Tube Dimensions | 88.5 mm x 310 mm (Dew Shield Outer Diameter x Compact Retracted Transport Length Profile) |
| Optical Tube Weight | 2.50 kg (5.51 lbs) (Bare framework tube weight omitting supplementary peripheral hardware handles) |
| Mount Attachment Type | CNC-Machined Aluminum Tube Ring Clamps paired with a standard GP-Level Vixen Dovetail Plate Frame |
| Finder Scope Specification | Universal quick-release finder bracket module base attached on the primary focuser housing assembly |
| Included Accessories | 70mm Quadruplet Optics, Integrated Field Flattener, 2.5-inch RPA Focuser, CNC Tube Rings, Vixen Dovetail Rail, 1.25-inch Adapter |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Dedicated flat-field wide-field tracking for astrophotography up to APS-C sensor profiles, erasing backfocus headaches via its integrated corrector system. |
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