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Radian AP 61/275 Raptor OTA Specs
| Brand | Radian (Radian Telescopes) |
| Full Model Code | Radian Telescopes Raptor 61 61mm f/4.5 Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | United States (Designed) / Taiwan (Manufactured) |
| Optical Design | Apochromatic Refractor (Triplet Lens Assembly featuring Ohara FPL-53 Synthetic Fluorite Center Component) |
| Aperture | 61 mm (2.40 inches) |
| Focal Length | 275 mm |
| Focal Ratio | f/4.5 |
| Optical Coatings | Ultra-Wideband Fully Multi-Coated Lens Matrix Anti-Reflection System |
| Glass Material | Ohara FPL-53 Premium Extra-Low Dispersion (ED) Glass Core |
| Secondary Mirror Obstruction | 0 mm (Refractor Design with Clear Optical Path Layout) |
| Secondary Mirror Obstruction by Diameter | 0.00% |
| Secondary Mirror Obstruction by Area | 0.00% |
| Resolving Power | 1.90 Arcseconds (Dawes), 2.26 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.5 |
| Highest Useful Magnification | 122x |
| Lowest Useful Magnification | 9x |
| Optical Tube Material | Precision Lightweight Aluminum Structure Body with Anodized Finish Accents |
| Focuser Style & Mechanism | 2.5-inch Dual-Speed Rack and Pinion Focuser with 10:1 Micro-Focus Drive and 360 Degree Rotator |
| Mirror Lock Mechanism | Not Applicable |
| Optical Tube Dimensions | 80 mm x 235 mm (With Dew Shield Retracted) |
| Optical Tube Weight | 1.80 kg (3.97 lbs) |
| Mount Attachment Type | Integrated Vixen-Style and Losmandy-Style Universal Dovetail Plate Configuration |
| Finder Scope Specification | Dual Finder Mounting Shoes Attached directly to the Hexagonal Tube Ring Array |
| Included Accessories | Raptor 61 Triplet Refractor, Built-In Dedicated Field Flattener Lens, Hexagonal Tube Rings, Universal Dovetail Bar, Dust Caps, Padded Travel Case |
| Standard Warranty | 1-Year Limited Warranty |
| Application | Fast ultra-wide-field travel astrophotography setups, deploying an integrated flattener core to produce pinpoint tracking circles out to full-frame image sensors. |
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