Bresser AC 90/900 Telescope Messier OTA
Classic design with razor-sharp images
The Bresser AC 90/900 is made for those who like to see the Moon, planets and star clusters in detail.
With its focal length of 900 mm, this refractor delivers a calm, high-contrast image - ideal for beginners and advanced users who want sharp, true-to-life results. The f/10 aperture ratio reduces color aberrations, keeping your image bright and clean.
Quickly ready to use
The telescope is compact, lightweight and easy to assemble. You can start observing right away thanks to the included accessories such as eyepiece, viewfinder and zenith mirror. Perfect if you want to quickly look into the sky without complicated settings.
Suitable for Moon, planets and star clusters
With its 90 mm aperture, the telescope captures enough light to show details invisible to the naked eye.
The Moon shows deep craters and sharp edges, Jupiter its cloud bands and moons, and Saturn shines with its rings. Bright star clusters such as the Pleiades also come to life.
Durably and reliably built
The aluminum tube construction is rugged but light, and the Vixen swallowtail makes it compatible with many mounts.
The telescope grows with you: ideal for expanding later with accessories or a stable mount.
What to expect
✓ Moon: excellent fit
✓ Planets: visible in great detail
✓ Star clusters: bright and contrasty
✗ Deep-sky: limited by f/10
✗ Astrophotography: not recommended
Specifications
Optics
| Feature | Description |
|---|---|
| Design | Achromat (refractor) |
| Type | Refractor |
| Aperture (mm) | 90 |
| Focal length (mm) | 900 |
| Aperture ratio (f/) | 10 |
| Resolution | 1,28″ |
| Limit value (mag) | 11,6 |
| Light output relative to eye | 170× |
| Max. useful magnification | 180× |
| Tube construction | Full tube |
| Tube weight (kg) | 2,5 |
Focuser
| Feature | Description |
|---|---|
| Design | Rack |
| Ocular connection | 1,25″ |
| Connection (camera side) | T2 |
| Reduction | Without |
Mount
| Feature | Description |
|---|---|
| Type of mount | Without a mount (OTA) |
| GoTo steering | No |
| Dovetail compatibility | Vixen-style |
Included accessories
| Section | Description |
|---|---|
| Ocular | 26 mm Super Plössl (1.25″) |
| Seeker | 6×30 viewfinder |
| Zenith mirror | 1.25″, 90° star diagonal |
| Solar filters | Yes |
| Dew cap | Yes |
| Tube Rings | Yes |
| Camera adapter | Smartphone adapter |
General
| Feature | Description |
|---|---|
| Series | Messier |
| Total weight (kg) | 2,5 |
| Application | Moon & Planets, Star clusters, Nature observation |
| Astrophotography | No |
| Recommended for | Advanced |
| Observatory use | No |
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