Bresser Telescope AC 90/900 Messier OTA (21611)

The traditional company Bresser offers telescopes under the Messier brand, providing an excellent price-performance ratio for ambitious beginners. These Messier telescope systems are expandable and retrofittable, making them suitable for use well beyond the initial entry point.

Bresser Messier R-90
The MESSIER R-90 is a fantastic option for those starting their journey into astronomy. With its 90 mm aperture, it gathers 200 times more light than the naked eye, allowing you to observe craters, valleys, and rims on the Moon from nearly 400,000 km away—as if you were right there!

This telescope delivers highly detailed views of not only the Moon but also other celestial objects. Observe Saturn's ring divisions millions of kilometers away or explore Jupiter's Great Red Spot, a massive atmospheric storm. Witness seasonal changes on Mars or spot Venus' crescent shape. The MESSIER R-90 provides images that are significantly brighter and clearer than those seen through Galileo Galilei’s telescope during his historic discoveries almost 400 years ago.

Specifications

Optics:

• Type: Refractor

• Build: Achromat

• Aperture: 90 mm

• Focal length: 900 mm

• Aperture ratio (f/): 10

• Resolving capacity: 1.28 arcseconds

• Limiting magnitude: 11.6 mag

• Light gathering capacity: 170x (compared to the human eye)

• Maximum useful magnification: 180x

• Tube weight: 2.5 kg

• Tube construction: Full tube

Focuser:

• Type of build: Gear rack

• Eyepiece connection size: 1.25"

• Camera-side threaded socket connection: T2 thread

• Gear reduction: Without

Mount Features:

• Mounting type: None (OTA only)

• GoTo control included? No

Included Accessories:

• Finder scope (6x30)

• SP eyepiece (26 mm, 1.25")

• Deviating optics (1.25", 90° star diagonal)

• Dew shield included

• Vixen-style prism rail included

• Tube clamps included

• Smartphone camera adapter included

General Information and Applications:
The MESSIER R-90 is part of Bresser’s Messier series and is ideal for observing the Moon, planets, nebulae, galaxies, and nature observation. It is also suitable for solar observation with appropriate solar filters but is not designed for astrophotography or permanent observatory setups.

Additional Details:
This telescope is recommended for advanced users but is not suitable for beginners or observatory installations. The total system weight is approximately 2.5 kg.