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TS Optics AP 90/540 OTA Specs
| Brand | TS Optics (Teleskop-Service) |
| Full Model Code | TS Optics Photoline 90 mm f/6 FPL53 Triplet Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Germany (Design / Quality Control) / Japan (Ohara Lens Core) |
| Optical Design | Apochromatic Refractor (3-Element Air-Spaced Triplet Objective Cell inside an adjustable mechanical cell frame) |
| Aperture | 90 mm (3.54 inches) |
| Focal Length | 540 mm |
| Focal Ratio | f/6.00 |
| Optical Coatings | Premium Broad-Band Fully Multi-Coated (FMC) layers across all air-to-glass lens transitions |
| Glass Material | Premium Japanese Ohara FPL-53 Extra-Low Dispersion Glass element paired with high-transparency special matching crown glass |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.29 Arcseconds (Dawes), 1.54 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.6 |
| Highest Useful Magnification | 180x |
| Lowest Useful Magnification | 13x |
| Optical Tube Material | Rigid Powder-Coated Aluminum Tube lined with precision internal stray-light trapping baffles |
| Focuser Style & Mechanism | 2.5-inch Heavy-Duty Gear-Driven Rack and Pinion Focuser featuring 360-degree rotation, M63x1 threads, and 10:1 micro-focusing reduction |
| Mirror Lock Mechanism | No (Equipped with robust non-marring structural friction drawtube clamp screws) |
| Optical Tube Dimensions | 95 mm x 430 mm (Tube Outer Diameter x Retracted Dew Shield Operating Length Profile) |
| Optical Tube Weight | 3.50 kg (7.72 lbs) (Baseline framework weight inclusive of the standard CNC ring set and mounting rail) |
| Mount Attachment Type | CNC-Machined Aluminum Tube Clamps paired with a universal Vixen-Style GP-Level Dovetail Plate Frame |
| Finder Scope Specification | Universal quick-release finder bracket shoe base mounted directly onto the primary focuser ring |
| Included Accessories | 90mm FPL53 Triplet Objective, Retractable Dew Shield, 2.5-inch R&P Focuser, CNC Tube Rings, Vixen Dovetail Bar |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Elite high-contrast visual exploration and aberration-free astrophotography, using premium Japanese triplet glass to yield exceptional color correction. |
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