Bresser Dobson telescope N 305/1525 Messier Hexafoc DOB (83049)

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.

Dobsonian Telescopes
Dobsonian telescopes are among the most practical instruments in astronomy. Their simple construction and innovative design make them highly popular. They consist of two main components: the optics, typically a solid tube or truss tube design, and the mount, a wooden box (commonly called a "rocker box") that sits on the ground and holds the telescope. This design allows users to begin observing immediately without requiring complicated setup or alignment.

The Dobsonian design was created with the goal of offering a large telescope at an affordable price, a goal that has been achieved remarkably well. Since its invention, Dobsonian telescopes have gained a dedicated fan base due to their simplicity and high performance at a low cost.

N 305/1500 to 1525 Optics
The large 305 mm aperture ensures that you will not outgrow this telescope for many years to come. Experienced observers will appreciate its ease of use and the spectacular views it offers. Compared to a 10-inch Newtonian, this 12-inch telescope provides 1.4 times more light-gathering power and a 0.1 arcsecond improvement in resolution. Its fast focal ratio ensures bright and clear images, making it ideal for deep-sky observations.

The excellent Hexafoc focuser features a large 64 mm aperture, ensuring no shading from the focuser tube even when using wide-field eyepieces.

Special Advantages of the Messier Series Dobsonian Telescopes

• The rocker box is equipped with metal quick-release connectors, allowing it to be disassembled and reassembled in minutes without requiring tools like a cordless screwdriver.

• A new 2.5" focuser is included, offering high rigidity and freedom from shifting.

• The optical tube is supported by pipe clamps with large altitude wheels on the sides. This setup allows the tube to be used on an equatorial mount if needed and enables rotation along its longitudinal axis for optimal eyepiece positioning. By adjusting the tube within the clamps, optimal balance can be achieved for smooth operation.

Specifications

Optics:

• Type: Reflector

• Build: Newtonian

• Aperture: 305 mm

• Focal length: 1525 mm

• Aperture ratio (f/): 5

• Resolving capacity: 0.45 arcseconds

• Limiting magnitude: 14.2 mag

• Light gathering capacity: 1900x (compared to the human eye)

• Maximum useful magnification: 610x

• Tube construction: Full tube

• Tube diameter: 342 mm

• Tube weight: 18.9 kg

• Tube material: Fiberglass

Reflector Features:

• Primary mirror material: PZ33

• Main mirror construction: Parabolic

• Secondary mirror design: Planar

• Secondary mirror diameter: 72 mm

• Secondary mirror obstruction (%): 24%

• Adjustable mirrors: Yes

• Ventilation for primary mirror: Yes

• Secondary mirror heating: No

Focuser:

• Type of build: Hexafoc

• Free aperture: 64 mm

• Motorized: No

• Gear reduction: Without

Mount Features:

• Type of mount: Dobsonian (Rockerbox)

• GoTo control included? No

Mount Details:

• Material: Wood

• Weight of mount only: 15 kg

• Accessory plate included

Included Accessories:

• SP eyepiece included (25 mm, 1.25")

• Finder scope included (6x30)

• Eyepiece adapter for both 1.25" and 2" eyepieces

• Extension tubes included

• Hybrid finder base included

• Solar filters included

• Battery compartment included

General Information and Applications:
The Messier Dobsonian series is part of Bresser’s Messier line and is ideal for observing the Moon, planets, nebulae, galaxies, and even the Sun (with appropriate solar filters). It is not suitable for astrophotography or nature observation but is perfect for beginners and advanced users seeking simplicity and performance.

Additional Details:
The total system weight is approximately 31 kg, with a shipping weight of around 38.8 kg. The eyepiece height at zenith is approximately 1600 mm. This telescope is recommended for both beginners and advanced users but is not intended for observatories.