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TS Optics Photon N 203/800 OTA Specs
| Brand | TS Optics (Teleskop-Service) |
| Full Model Code | TS Optics Photon 8-inch f/4 Newtonian Astrograph Optical Tube Assembly |
| Country of Origin | Taiwan (Manufacturing Execution) / Germany (Design / Quality Control Oversight) |
| Optical Design | Newtonian Reflector Astrograph (Parabolic Primary Mirror paired with an oversized flat secondary mirror for full sensor illumination) |
| Aperture | 203 mm (7.99 inches) |
| Focal Length | 800 mm |
| Focal Ratio | f/3.94 |
| Optical Coatings | Enhanced Aluminum Mirror Coating achieving 94% overall reflectivity backed with a protective quartz overlayer |
| Glass Material | Standard BK7 Optical Glass substrate engineered for high surface precision and uniform thermal stability |
| Secondary Mirror Obstruction | 70 mm (Minor axis width footprint profile of the interior diagonal spider mirror) |
| Secondary Mirror Obstruction by Diameter | 34.5% |
| Secondary Mirror Obstruction by Area | 11.89% |
| Resolving Power | 0.57 Arcseconds (Dawes), 0.68 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 13.3 |
| Highest Useful Magnification | 406x |
| Lowest Useful Magnification | 29x |
| Optical Tube Material | Rigid Roll-Formed Steel Main Tube built with an internal matte-black anti-reflection wall finish |
| Focuser Style & Mechanism | 2-inch Heavy-Duty Dual-Speed Monorail Focuser with steel tracking guide rails, 1:10 micro-reduction, and independent drawtube alignment |
| Mirror Lock Mechanism | Yes (Adjustable mechanical pull-and-push primary cell positioning bolts paired with independent structural lock screws) |
| Optical Tube Dimensions | 230 mm x 730 mm (Tube Outer Diameter x Working Longitudinal Structural Chassis Layout) |
| Optical Tube Weight | 8.40 kg (18.52 lbs) (Total weight rating inclusive of standard CNC ring blocks and integrated dovetail bar) |
| Mount Attachment Type | CNC-Machined Aluminum Tube Clamps paired with a universal Vixen-Style GP-Level Dovetail Plate Frame |
| Finder Scope Specification | 8x50 Achromatic Finder Scope module mounted on an adjustable secondary quick-release foot block |
| Included Accessories | 203mm Parabolic Optical Tube, 2-inch Monorail Focuser, 8x50 Finder Scope, CNC Tube Rings, Vixen Dovetail Rail, 2-inch Extension Tube |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-speed deep-sky astrophotography, leveraging an aggressive f/4 configuration and a reinforced monorail focuser on a reliable steel chassis setup. |
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