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TS Optics AP 125/975 OTA Specs
| Brand | TS Optics (Teleskop-Service) |
| Full Model Code | TS Optics Photoline 125 mm f/7.8 FPL53 Lanthanum Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Germany (Design / Quality Control) / Japan (Ohara Lens Core) |
| Optical Design | Apochromatic Refractor (2-Element Air-Spaced Doublet Objective Cell optimized for mechanical balance) |
| Aperture | 125 mm (4.92 inches) |
| Focal Length | 975 mm |
| Focal Ratio | f/7.80 |
| Optical Coatings | High-Transmission Broad-Band Multi-Coated Matrix on all air-to-glass lens boundaries |
| Glass Material | Premium Japanese Ohara FPL-53 Extra-Low Dispersion Glass core combined with a specialized Lanthanum mating element |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 0.93 Arcseconds (Dawes), 1.11 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.3 |
| Highest Useful Magnification | 250x |
| Lowest Useful Magnification | 18x |
| Optical Tube Material | Robust Powder-Coated Aluminum Main Tube fitted with computer-calculated interior contrast baffles |
| Focuser Style & Mechanism | 2.5-inch Heavy-Duty Gear-Driven Rack and Pinion Focuser featuring 360-degree rotation, M68x1/M63x1 threads, and 10:1 micro-focusing reduction |
| Mirror Lock Mechanism | No (Equipped with an integrated split-ring tension lock mechanism) |
| Optical Tube Dimensions | 140 mm x 850 mm (Tube Outer Diameter x Retracted Dew Shield Transport Length) |
| Optical Tube Weight | 7.57 kg (16.69 lbs) (Total weight including CNC structural ring clamps and Vixen mounting bar) |
| Mount Attachment Type | CNC-Machined Aluminum Tube Rings connected to a standard GP-Level Vixen Dovetail Plate Frame |
| Finder Scope Specification | Dual integrated Synta-style finder shoes located on the primary focuser housing configuration |
| Included Accessories | 125mm FPL53/Lanthanum Doublet Lens, Retractable Dew Shield, 2.5-inch R&P Focuser, CNC Tube Rings, GP Dovetail Rail, Removable Tube Extension Segment |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-resolution lunar, planetary, and double-star tracking, using a premium doublet layout to compete directly with triplet performance while saving structural weight. |
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