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Toscanoptics Cassegrain-Dall Kirkham 231/2650 OTA Specs
| Brand | Toscanoptics |
| Full Model Code | Toscanoptics Cassegrain-Dall Kirkham 231/2650 High-End Carbon Fiber Astrograph Optical Tube Assembly |
| Country of Origin | Italy (Custom Technical Design / Fabrication Sourcing) |
| Optical Design | Dall-Kirkham Cassegrain Reflector (Concave Elliptic Primary Mirror combined with a Convex Spherical Secondary Mirror configuration) |
| Aperture | 231 mm (9.09 inches) |
| Focal Length | 2650 mm |
| Focal Ratio | f/11.47 |
| Optical Coatings | Highly Reflective Multi-Coated Layer Matrix with protective overcoat stabilization layers |
| Glass Material | High-Grade BK7 Structural Glass substrate for the primary mirror and specialized Suprax substrate for the secondary element |
| Secondary Mirror Obstruction | 32 mm |
| Secondary Mirror Obstruction by Diameter | 13.85% |
| Secondary Mirror Obstruction by Area | 1.91% |
| Resolving Power | 0.60 Arcseconds (Dawes), 0.72 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.3 |
| Highest Useful Magnification | 462x |
| Lowest Useful Magnification | 33x |
| Optical Tube Material | Ultra-Lightweight Rigid Carbon Fiber Tube Assembly providing exceptional structural thermal expansion coefficients |
| Focuser Style & Mechanism | 2-inch Precision Crayford Focuser Unit with fine-friction drive components and 250mm extensive backfocus clearance threshold |
| Mirror Lock Mechanism | No (Fixed Primary Mirror alignment configuration completely eliminating focus shifting during target sweeps) |
| Optical Tube Dimensions | 250 mm x 720 mm (Tube Outer Diameter x Approximate Core Assembly Operating Length) |
| Optical Tube Weight | 9.00 kg (19.84 lbs) (Bare Optical Tube Assembly weight framework) |
| Mount Attachment Type | Heavy-Duty CNC Machined Mounting Rail Bars matching universal equatorial system frameworks |
| Finder Scope Specification | Universal modular finder block shoe pre-drilled and mounted onto the rear mirror housing framework |
| Included Accessories | 231mm Elliptic BK7 Primary, Spherical Suprax Secondary, Carbon Fiber Main Tube, 2-inch Crayford Focuser, Mounting Rail Framework |
| Standard Warranty | 2-Year Limited Warranty |
| Application | High-resolution planetary imaging, close-range lunar tracking campaigns, and advanced deep-sky astrophotography, leveraging an extensive backfocus profile for heavy instrument arrays. |
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