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Bresser AC 90/1200 Messier EXOS-2 Telescope
Using a high-load equatorial platform, the Bresser AC 90/1200 Messier EXOS-2 Telescope provides a 90mm achromatic refractor with manual tracking and integrated polar-scope hardware.
- EXOS-2 mount includes integrated polar scope
- Long 1200mm focal length uses f/13.3 optics
- 90mm aperture provides 1.28-arcsecond resolution
- 2.5-inch Hexafoc focuser supports manual adjustment
- 26mm eyepiece provides listed 46x magnification
- Heavy-duty tripod and counterweight included
In Stock
Description
Minimizing flexure across a long tube, the Bresser AC 90/1200 Messier EXOS-2 Telescope takes this long 90mm tube’s flexure risk seriously: a high-load platform built to keep a 1200mm focal length balanced cleanly through fine manual adjustments, rather than sagging or drifting mid-session.
A long, narrow optical tube like this one is more sensitive to mount rigidity than a shorter scope — any flex in the mount translates directly into image drift at 180x. The EXOS-2’s integrated polar scope and high-load rating exist specifically to minimize that, and the heavy-duty stainless tripod settles noticeably faster after each careful adjustment than the standard EXOS-1 build.
Key Features of Bresser AC 90/1200 Messier EXOS-2 Telescope
A high-load equatorial platform with an integrated polar scope minimizes the flexure risk this tube’s long focal length introduces, solving a limitation the EXOS-1 handles less completely.
- Integrated polar scope speeds up accurate alignment before a session
- High-load equatorial design minimizes flexure across this tube’s 1200mm length
- Upgrade-ready for a future dual-axis motorized or GoTo kit without replacing the mount
- Heavy-duty stainless steel tripod adds rigidity beyond the EXOS-1’s standard build
- Included counterweight balances the tube precisely once mounted
- 2-inch zenith mirror accepts wide-field eyepieces for richer views
- Reduced flexure keeps this long tube’s fine detail actually visible in the eyepiece
How the EXOS-2 Compares
Against the EXOS-1 sharing this same tube, the EXOS-2’s high-load rating directly addresses this focal length’s flexure sensitivity — a real advantage for anyone doing extended high-magnification sessions rather than quick looks.
Applications & Use Cases
Built as a highly rigid manual tracking platform, this telescope suits high-resolution planetary and lunar investigation, minimizing flexure during fine manual adjustments across a full session.
- Observers running extended sessions where flexure would show in the eyepiece
- Anyone considering a future motorized upgrade for this focal length
- Buyers who found the EXOS-1’s rigidity wanting at this focal length
Bresser Warranty & Support
The AR-90L/1200 EXOS-2 carries a 2-Year Factory Warranty covering manufacturing defects, handled directly through Bresser’s support channel.
Bresser AC 90/1200 Messier EXOS-2 Telescope Specs
| Brand | Bresser |
| Full Model Code | Bresser Messier AR-90L/1200 EXOS-2 |
| Country of Origin | Germany |
| Optical Design | Achromatic Refractor (Long Focal Ratio Configuration) |
| Aperture | 90 mm (3.54 inches) |
| Focal Length | 1200 mm |
| Focal Ratio | f/13.3 |
| 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 | 1.28 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 1180 mm |
| Optical Tube Weight | 4.6 kg (10.14 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 (46x), 2-inch Zenith Mirror (90-degree), 1.25-inch Adapter, EXOS-2 Equatorial Mount, Heavy-Duty Stainless Steel Field Tripod, 1x 4.5kg Counterweight |
| Standard Warranty | 2-Year Factory Warranty |
| Application | Highly rigid manual tracking platform for high-resolution planetary and lunar investigation, minimizing flexure and balancing the long optical framework cleanly during fine manual adjustments. |
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