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Bresser AC 90/500 Messier EXOS-2 Telescope Specs
| Brand | Bresser |
| Full Model Code | Bresser Messier AR-90S/500 EXOS-2 |
| Country of Origin | Germany |
| Optical Design | Achromatic Refractor (Short Tube Configuration) |
| Aperture | 90 mm (3.54 inches) |
| Focal Length | 500 mm |
| Focal Ratio | f/5.6 |
| Optical Coatings | Multi-Coated Optics |
| Secondary Mirror Obstruction | 0 mm (0%) |
| Secondary Mirror Obstruction by Area | 0% |
| Backfocus Distance | 110 mm |
| Rear Cell Thread Type | M42x0.75 Male T-thread via integrated adapter |
| Image Circle Diameter | 30 mm |
| Resolving Power | 1.28 Arcseconds |
| Limiting Visual Magnitude | 11.6 |
| Highest Useful Magnification | 180x |
| Lowest Useful Magnification | 13x |
| Optical Tube Material | Aluminum |
| Focuser Style & Mechanism | 2.5-inch Hexafoc Heavy-Duty Rack and Pinion Focuser |
| Mirror Lock Mechanism | No (Refractor Tube Configuration) |
| Optical Tube Dimensions | 103 mm x 480 mm |
| Optical Tube Weight | 1.9 kg (4.19 lbs) - Tube Only |
| Mount Attachment Type | EXOS-2 High-Load German Equatorial Mount with Integrated Polar Scope |
| Finder Scope Specification | 6x30 Optical Finder Scope |
| Included Accessories | 26mm Super Plossl Eyepiece (19x), 1.25-inch Zenith Mirror (90-degree), EXOS-2 Equatorial Mount, Heavy-Duty Stainless Steel Field Tripod, 1x 4.5kg Counterweight |
| Standard Warranty | 2-Year Factory Warranty |
| Application | Highly stable manual tracking of wide-field deep-sky configurations, providing an exceptionally rigid, vibration-free foundation prepared for electronic upgrade modules. |
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