Bresser Telescope AC 90/500 Messier OTA (54712)

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.

Achromatic Refractor AC 90/500
The AC 90/500 is a versatile achromatic refractor that combines excellent light-gathering capabilities with a wide field of view. Its 90 mm aperture ensures good light performance, while the 500 mm focal length makes it perfect for wide-field observations of open star clusters and the Milky Way. These features make it an attractive choice not only for beginners but also for experienced observers.

If your primary interest is observing the Moon and planets, a telescope with a longer focal length, such as the AC 90/900, may be more suitable.

This telescope comes with a comprehensive set of accessories, allowing you to start observing the sky immediately after unpacking. For land-based observation, adding an Amici prism is recommended.

Specifications

Optics:

• Type: Refractor

• Build: Achromat

• Aperture: 90 mm

• Focal length: 500 mm

• Aperture ratio (f/): 5.5

• Resolving capacity: 1.28 arcseconds

• Limiting magnitude: 11.6 mag

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

• Maximum useful magnification: 180x

• Tube material: Aluminum

• Tube length: 480 mm

• Tube diameter: 105 mm

• Tube weight: 1.9 kg

• Tube construction: Full tube

Focuser:

• Type of build: Gear rack

• Eyepiece connection size: 1.25"

Mount Features:

• Mounting type: None (OTA only)

Included Accessories:

• SP eyepiece (26 mm, 1.25")

• Finder scope (6x30)

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

• Dew shield included

• Slow-motion cable included

• Vixen-style prism rail included

• Tube clamps included

General Information and Applications:
The AC 90/500 is part of Bresser’s Messier series and is ideal for observing the Moon, planets, nebulae, and galaxies. However, it is not designed for astrophotography, nature observation, or solar observation (unless used with an appropriate solar filter).

Additional Details:
This telescope is recommended for advanced users but is not suitable for beginners or permanent observatory setups.