Bresser AC 90/500 Messier EXOS-2 Telescope
Matched with a high-load mount, the Bresser AC 90/500 Messier EXOS-2 Telescope supplies a 90mm short-tube refractor with manual tracking and integrated polar-scope alignment hardware.
- EXOS-2 mount includes integrated polar scope
- 90mm aperture provides 1.28-arcsecond resolution
- 500mm focal length uses f/5.6 optics
- Manual platform supports future GoTo upgrades
- 26mm eyepiece provides listed 19x magnification
- Heavy-duty tripod and counterweight included
In Stock
Description
Built to accept a future upgrade module, the Bresser AC 90/500 Messier EXOS-2 Telescope is the high-load option in this mount family, rigid enough that Bresser markets it as ready for motorized tracking down the road. Run it manually today and add that automation later without replacing the mount itself, protecting an investment that would otherwise need swapping out entirely once you decide GoTo tracking is worth the cost.
Do you need a high-load mount for a 90mm scope this light? Not strictly for the optics’ weight, but for what a rock-solid, vibration-free platform does for extended high-magnification sessions: less settling time after each adjustment, and headroom if you ever add a heavier eyepiece or camera down the line. The integrated polar scope built into the mount head also speeds up alignment considerably compared to sighting along the axis by eye, which matters most on a cold night when patience runs thin and every extra minute outside counts against comfort.
Key Features of Bresser AC 90/500 Messier EXOS-2 Telescope
An integrated polar scope built into the EXOS-2 mount head simplifies polar alignment compared to sighting along the axis by eye, cutting setup time meaningfully on a night with limited observing hours.
- Integrated polar scope speeds up accurate polar alignment before a session
- High-load German equatorial design stays vibration-free even at high magnification
- Heavy-duty stainless steel field tripod adds rigidity beyond the standard EXOS-1 build
- Prepared for a future electronic GoTo upgrade module without replacing the mount
- Included counterweight balances the tube precisely once mounted
- 26mm Super Plossl eyepiece delivers 19x magnification right out of the box
- Upgrade path protects the initial investment if GoTo tracking becomes a priority later
The EXOS-2 Advantage
Against the EXOS-1 sharing this optical tube, the EXOS-2’s integrated polar scope and high-load rating make polar alignment faster and the platform more rigid at high magnification. The real long-term advantage is the upgrade path: this same mount accepts a motorized module later, so buying the EXOS-2 manual version now doesn’t close the door on GoTo tracking down the road, unlike committing to a fixed-mode mount elsewhere in this catalog.
Applications & Use Cases
Built for highly stable manual tracking of wide-field deep-sky targets, this telescope provides a vibration-free foundation ready for a future electronic upgrade whenever the budget allows, without forcing that decision at the point of purchase.
- Observers who want a mount they can motorize later without replacing it
- Anyone running extended high-magnification sessions where rigidity matters
- Buyers deciding between manual and GoTo who want to defer that choice
Bresser Warranty & Support
The AC 90/500 EXOS-2 carries a 2-Year Factory Warranty covering manufacturing defects, handled directly through Bresser’s support channel.
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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