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TS Optics AP 61/274 EDPH II OTA Specs
| Brand | TS Optics (Teleskop-Service) |
| Full Model Code | TS Optics 61EDPH II Fast Wide-Field Triplet Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | Germany (Design / Quality Control) / China (Manufacturing Assembly Sourcing) |
| Optical Design | Apochromatic Astrograph (3-Element Air-Spaced Triplet Objective Cell optimized for wide field projection) |
| Aperture | 61 mm (2.40 inches) |
| Focal Length | 274 mm |
| Focal Ratio | f/4.50 |
| Optical Coatings | High-Transmission Broad-Band Multi-Coated Layer Matrix on all air-to-glass lens transitions |
| Glass Material | Premium Extra-Low Dispersion Glass substrate combined with custom matching elements to reduce chromatic error boundaries |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 1.90 Arcseconds (Dawes), 2.26 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 10.7 |
| Highest Useful Magnification | 122x |
| Lowest Useful Magnification | 9x |
| Optical Tube Material | Ultra-Compact CNC Machined Aluminum Tube Assembly fitted with an integrated internal light-trapping flocking layer |
| Focuser Style & Mechanism | 2.5-inch Heavy-Duty Rack and Pinion Focuser featuring 10:1 Dual-Speed Micro-Focus reduction and M63x1 internal adaptation threads |
| Mirror Lock Mechanism | No (Equipped with manual drawtube friction locking tension adjustments) |
| Optical Tube Dimensions | 80 mm x 264 mm (Dew Shield Outer Diameter x Fully Retracted Transport Length Profile) |
| Optical Tube Weight | 1.80 kg (3.97 lbs) (Total running weight including the specialized multi-functional ring handle clamp) |
| Mount Attachment Type | Multi-Functional CNC Clamshell Ring Ring integrated onto a Vixen-Style Dovetail Bar with 1/4-inch photo tripod adapter threads |
| Finder Scope Specification | Standard tracking finder module bracket slot pre-machined into the top carrying handle framework |
| Included Accessories | 61mm Triplet APO Objective, Retractable Dew Shield, 2.5-inch RPA Focuser, Multi-Functional Tube Ring, Vixen/Photo Dovetail Plate Frame |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Ultra-portable grab-and-go wide-field astrophotography and deep-sky wide sweeps, providing a fast native focal footprint for travel mounts. |
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