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Bresser AC 90/900 Messier EXOS-1 Telescope Specs
| Brand | Bresser |
| Full Model Code | Bresser Messier AR-90L/900 EXOS-1 |
| Country of Origin | Germany |
| Optical Design | Achromatic Refractor |
| Aperture | 90 mm (3.54 inches) |
| Focal Length | 900 mm |
| Focal Ratio | f/10 |
| Optical Coatings | Multi-Coated Optics |
| Secondary Mirror Obstruction | 0 mm (0%) |
| Secondary Mirror Obstruction by Area | 0% |
| Backfocus Distance | 120 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 | 93 mm x 900 mm |
| Optical Tube Weight | 3.2 kg (7.05 lbs) - Tube Only |
| Mount Attachment Type | EXOS-1 German Equatorial Mount with Manual Flexible Shafts |
| Finder Scope Specification | 6x30 Optical Finder Scope |
| Included Accessories | 26mm Super Plossl Eyepiece (34x), 2-inch Zenith Mirror (90-degree), 1.25-inch Adapter, EXOS-1 Equatorial Mount, Stainless Steel Field Tripod, 1x 4.5kg Counterweight |
| Standard Warranty | 2-Year Factory Warranty |
| Application | Manual right-ascension tracking of lunar geology and planetary disks using a firm mechanical equatorial coordinate structure designed for smooth adjustment cycles. |
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