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Bresser AC 102/1350 Messier Hexafoc EXOS-1
A 1350mm focal length defines the Bresser AC 102/1350 Messier Hexafoc EXOS-1, pairing its 102mm achromatic refractor with a manually controlled EXOS-1 equatorial mount.
- f/13.2 configuration suits listed planetary observation
- 1.14-arcsecond resolving power from 102mm aperture
- 2.5-inch Hexafoc focuser provides rack-and-pinion control
- Manual equatorial movement uses flexible shafts
- 26mm eyepiece supplies listed 52x magnification
- 6×30 finder, tripod, counterweight included
In Stock
Description
Splitting close double stars precisely, the Bresser AC 102/1350 Messier Hexafoc EXOS-1 pairs a 102mm achromat at f/13.2 with a manual equatorial mount on a stainless steel tripod — an ultra-long ratio that keeps chromatic aberration minimal at the cost of a narrow field, built for fine lunar rilles and tight solar system detail.
Splitting close double stars rewards a steady, precise mount more than almost any other kind of observing — the EXOS-1’s flexible-shaft controls let you make the fine corrections this ultra-long focal length demands without the image jumping between adjustments. The included counterweight and accessory tray complete a kit ready for a first detail-focused session without needing to source additional hardware.
Key Features of Bresser AC 102/1350 Messier Hexafoc EXOS-1
A manual equatorial mount with flexible-shaft controls suits this ultra-long focal ratio’s need for precise, drift-free tracking, rewarding an observer patient enough to master fine hand corrections.
- Manual flexible shafts allow fine tracking corrections at this tube’s high magnifications
- Stainless steel field tripod stays steady across this tube’s 1350mm focal length
- 2-inch zenith mirror accepts wide-field eyepieces for richer views
- Included counterweight balances the 5.9kg tube properly once mounted
- 6×30 optical finder scope speeds up target acquisition in the dark
- Included 26mm Super Plossl eyepiece delivers 52x magnification right out of the box
- Ultra-long ratio suits double-star observers chasing minimal chromatic aberration
The EXOS-1 Advantage
Against the GoTo version sharing this same tube, the EXOS-1 keeps things manual and battery-free — a fair trade for observers who enjoy the precision of hand-tracking close double stars rather than automating the process entirely.
Applications & Use Cases
Built for high-precision manual observation, this telescope delivers exceptional contrast on planetary surface details, lunar rilles, and close double stars for a patient, detail-focused observer.
- Double-star observers wanting minimal chromatic aberration
- Anyone focused on fine lunar and planetary surface detail
- Buyers who enjoy the discipline of precise manual tracking
Bresser Warranty & Support
The AC 102/1350 EXOS-1 carries a 2-Year Factory Warranty covering manufacturing defects, handled directly through Bresser’s support channel.
Bresser AC 102/1350 Messier Hexafoc EXOS-1 Specs
| Brand | Bresser |
| Full Model Code | Bresser Messier AC 102/1350 EXOS-1 |
| Country of Origin | Germany |
| Optical Design | Achromatic Refractor (Long Focal Ratio Configuration) |
| Aperture | 102 mm (4.01 inches) |
| Focal Length | 1350 mm |
| Focal Ratio | f/13.2 |
| Optical Coatings | Multi-Coated Optics |
| Secondary Mirror Obstruction | 0 mm (0%) |
| Secondary Mirror Obstruction by Area | 0% |
| Backfocus Distance | 130 mm |
| Rear Cell Thread Type | M42x0.75 Male T-thread via integrated adapter |
| Image Circle Diameter | 30 mm |
| Resolving Power | 1.14 Arcseconds |
| Limiting Visual Magnitude | 11.8 |
| Highest Useful Magnification | 200x |
| Lowest Useful Magnification | 15x |
| 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 1330 mm |
| Optical Tube Weight | 5.9 kg (13.0 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 (52x), 2-inch Zenith Mirror (90-degree), 1.25-inch Adapter, EXOS-1 Equatorial Mount, Stainless Steel Field Tripod, 1x 4.5kg Counterweight |
| Power Requirements | None (Manual Mount) |
| Standard Warranty | 2-Year Factory Warranty |
| Application | High-precision manual observation and exceptional contrast tracking of planetary surface details, lunar rilles, and close double stars with highly minimized chromatic aberration due to the ultra-long f/13.2 optical design. |
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